After a long speel and obsession with Fallout 3 I'm coming back to my baby and I was eager to pick up where I left off. So I downloaded all of my favorite mods including Children of Morrowind and MCA.
But after getting all of my mods together and getting ready to play my game pops up a list of Errors for MCA (6.1 I believe) and then after I stepped off of the boat it popped up a list of animation errors for CoM and then crashed. I was wondering if anyone had any fixes or ideas on how this can be prevented.

Open your Warning.txt after the crash and post the text here, so we can see the exact errors.

The animation errors can be fixed by pressing the "Fix Animation Errors" button in the AnimKit. (assuming you're getting the standard animation errors)

It seems that it is being caused by more than just, the two mods I had anticipated but by many. I may just have to start with a fresh slate because, I'm a little confused I've never had these problems before.

But here is my warnings text to see if it can be fixed: As I said it is a pretty long list so.... Meh Maybe I'll just start off with a clean slate and attempt to do it again.

One of the files that "Clean Solstheim_Castle_v1.1.esp" is dependent on has changed since the last save.
This may result in errors. Saving again will clear this message
but not necessarily fix any errors.
One of the files that "CM_Partners_2.8.esp" is dependent on has changed since the last save.
This may result in errors. Saving again will clear this message
but not necessarily fix any errors.
One of the files that "Starfires NPC Additions ver-1.11.esp" is dependent on has changed since the last save.
This may result in errors. Saving again will clear this message
but not necessarily fix any errors.
One of the files that "CoM_Fix.ESP" is dependent on has changed since the last save.
This may result in errors. Saving again will clear this message
but not necessarily fix any errors.
One of the files that "Animated Morrowind 1.0.esp" is dependent on has changed since the last save.
This may result in errors. Saving again will clear this message
but not necessarily fix any errors.
One of the files that "MCA - Guards Patch.ESP" is dependent on has changed since the last save.
This may result in errors. Saving again will clear this message
but not necessarily fix any errors.
One of the files that "Hold it - replacer.esp" is dependent on has changed since the last save.
This may result in errors. Saving again will clear this message
but not necessarily fix any errors.
One of the files that "Hold it - MCA addon.esp" is dependent on has changed since the last save.
This may result in errors. Saving again will clear this message
but not necessarily fix any errors.
One of the files that "Hold it - SF npc addon.esp" is dependent on has changed since the last save.
This may result in errors. Saving again will clear this message
but not necessarily fix any errors.
One or more plugins could not find the correct versions of the master files they depend on. Errors may occur during load or game play. Check the "Warnings.txt" file for more information.
Unable to find script 'mca_minstrels' on object '_MCA_minstrel_altmer_f'.
Unable to find script 'mca_minstrels' on object '_MCA_minstrel_bosmer_f'.
Unable to find script 'mca_minstrels' on object '_MCA_minstrel_breton_f'.
Unable to find script 'mca_minstrels' on object '_MCA_minstrel_dunmer_f'.
Unable to find script 'mca_minstrels' on object '_MCA_minstrel_imp_f'.
Unable to find script 'mca_minstrels' on object '_MCA_minstrel_nord_f'.
Unable to find script 'mca_minstrels' on object '_MCA_minstrel_redg_f'.
Unable to find script 'mca_colonists' on object '_MCA_colonist_imp_m'.
Unable to find script 'mca_colonists' on object '_MCA_colonist_imp_f'.
Unable to find script 'mca_colonists' on object '_MCA_colonist_dun_m'.
Unable to find script 'mca_colonists' on object '_MCA_colonist_dun_f'.
Item "_MCA_rogue_shield" not found on "_MCA_rogue_bosmer_f".
Item "_MCA_rogue_gauntlets" not found on "_MCA_rogue_bosmer_f".
Item "_MCA_rogue_shield" not found on "_MCA_rogue_bosmer_m".
Item "_MCA_rogue_gauntlets" not found on "_MCA_rogue_bosmer_m".
Item "_MCA_rogue_shield" not found on "_MCA_rogue_breton_f".
Item "_MCA_rogue_gauntlets" not found on "_MCA_rogue_breton_f".
Item "_MCA_rogue_shield" not found on "_MCA_rogue_breton_m".
Item "_MCA_rogue_gauntlets" not found on "_MCA_rogue_breton_m".
Item "_MCA_rogue_shield" not found on "_MCA_rogue_dunmer_f".
Item "_MCA_rogue_gauntlets" not found on "_MCA_rogue_dunmer_f".
Item "_MCA_rogue_shield" not found on "_MCA_rogue_dunmer_m".
Item "_MCA_rogue_gauntlets" not found on "_MCA_rogue_dunmer_m".
Item "_MCA_rogue_shield" not found on "_MCA_rogue_imperial_f".
Item "_MCA_rogue_gauntlets" not found on "_MCA_rogue_imperial_f".
Item "_MCA_rogue_shield" not found on "_MCA_rogue_imperial_m".
Item "_MCA_rogue_gauntlets" not found on "_MCA_rogue_imperial_m".
Item "_MCA_wigs_imperial_m_noleaves" not found on "_MCA_rogue_imperial_m".
Item "_MCA_rogue_shield" not found on "_MCA_rogue_khajiit_f".
Item "_MCA_rogue_helmet_open" not found on "_MCA_rogue_khajiit_f".
Item "_MCA_rogue_gauntlets" not found on "_MCA_rogue_khajiit_f".
Item "_MCA_rogue_shield" not found on "_MCA_rogue_khajiit_m".
Item "_MCA_rogue_helmet_open" not found on "_MCA_rogue_khajiit_m".
Item "_MCA_rogue_gauntlets" not found on "_MCA_rogue_khajiit_m".
Item "_MCA_masks_altmer" not found on "_MCA_mage_altmer_f".
Item "_MCA_masks_altmer" not found on "_MCA_mage_altmer_m".
Item "_MCA_rogue_shield" not found on "_MCA_rogue_redguard_f".
Item "_MCA_rogue_gauntlets" not found on "_MCA_rogue_redguard_f".
Item "_MCA_rogue_shield" not found on "_MCA_rogue_redguard_m".
Item "_MCA_rogue_gauntlets" not found on "_MCA_rogue_redguard_m".
Item "_MCA_masks_altmer" not found on "_MCA_commoner_alt_f".
Item "_MCA_masks_altmer" not found on "_MCA_commoner_alt_m".
Item "_MCA_noble_gloves_extravagant" not found on "_MCA_noble_imp_m2".
Item "_MCA_masks_altmer" not found on "_MCA_telvanni_altmer_f".
Item "_MCA_telvanni_robe" not found on "_MCA_telvanni_altmer_f".
Item "_MCA_masks_altmer" not found on "_MCA_telvanni_altmer_m".
Item "_MCA_telvanni_robe" not found on "_MCA_telvanni_altmer_m".
Item "_MCA_telvanni_robe" not found on "_MCA_telvanni_bosmer_f".
Item "_MCA_telvanni_robe" not found on "_MCA_telvanni_bosmer_m".
Item "_MCA_telvanni_robe" not found on "_MCA_telvanni_breton_m".
Item "_MCA_telvanni_robe" not found on "_MCA_telvanni_breton_f".
Item "_MCA_telvanni_robe" not found on "_MCA_telvanni_dunmer_m".
Item "_MCA_telvanni_robe" not found on "_MCA_telvanni_dunmer_f".
Item "_MCA_masks_altmer" not found on "_MCA_merchant_altmer_m".
Item "_MCA_masks_altmer" not found on "_MCA_merchant_altmer_f".
Item "_MCA_masks_altmer" not found on "_MCA_bard_altmer_m".
Item "_MCA_masks_altmer" not found on "_MCA_minstrel_altmer_m".
Item "_MCA_masks_altmer" not found on "_MCA_bard_altmer_f".
Item "_MCA_minstrel_skirt" not found on "_MCA_minstrel_altmer_f".
Item "_MCA_masks_altmer" not found on "_MCA_minstrel_altmer_f".
Item "_MCA_minstrel_skirt" not found on "_MCA_minstrel_bosmer_f".
Item "_MCA_minstrel_skirt" not found on "_MCA_minstrel_breton_f".
Item "_MCA_minstrel_skirt" not found on "_MCA_minstrel_dunmer_f".
Item "_MCA_minstrel_skirt" not found on "_MCA_minstrel_imp_f".
Item "_MCA_minstrel_skirt" not found on "_MCA_minstrel_nord_f".
Item "_MCA_minstrel_skirt" not found on "_MCA_minstrel_redg_f".
Item "_MCA_noble_gloves_extravagant" not found on "_MCA_noble_dunmer_m2".
Item "_MCA_noble_gloves_extravagant" not found on "_MCA_noble_imp_f2".
Item "_MCA_noble_gloves_extravagant" not found on "_MCA_noble_dunmer_f2".
Item "_MCA_noble_gloves_expensive" not found on "_MCA_noble_dunmer_f4".
Item "_MCA_noble_gloves_expensive" not found on "_MCA_noble_dunmer_m4".
Item "_MCA_noble_gloves_expensive" not found on "_MCA_noble_imp_f4".
Item "_MCA_noble_gloves_extravagant" not found on "_MCA_noble_breton_f2".
Item "_MCA_noble_gloves_expensive" not found on "_MCA_noble_breton_f4".
Item "_MCA_masks_altmer" not found on "_MCA_noble_altmer_m".
Item "_MCA_noble_gloves_extravagant" not found on "_MCA_noble_nord_f2".
Item "_MCA_noble_gloves_expensive" not found on "_MCA_noble_nord_f4".
Item "_MCA_noble_gloves_extravagant" not found on "_MCA_noble_redguard_f2".
Item "_MCA_noble_gloves_expensive" not found on "_MCA_noble_redguard_f4".
Item "_MCA_noble_gloves_extravagant" not found on "_MCA_noble_bosmer_f2".
Item "_MCA_noble_gloves_expensive" not found on "_MCA_noble_bosmer_f4".
Item "_MCA_noble_gloves_extravagant" not found on "_MCA_noble_altmer_f2".
Item "_MCA_masks_altmer" not found on "_MCA_noble_altmer_f2".
Item "_MCA_noble_gloves_expensive" not found on "_MCA_noble_altmer_f4".
Item "_MCA_masks_altmer" not found on "_MCA_noble_altmer_f4".
Item "_MCA_masks_altmer" not found on "_MCA_noble_altmer_f5".
Item "_MCA_masks_altmer" not found on "_MCA_noble_altmer_f3".
Item "_MCA_masks_altmer" not found on "_MCA_noble_altmer_f6".
Item "_MCA_masks_altmer" not found on "_MCA_noble_altmer_f1".
Not able to find Foot part in BC_shoes_common_1.
Not able to find Foot part in BC_shoes_common_5.
Not able to find Foot part in BC_shoes_extrav_2_f.
Model Load Error: Meshes\Em_kids\em_rockinghorse2.NIF cannot load file in Meshes\Em_kids\em_rockinghorse2.NIF.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_kids\em_tk_Sandbox2.NIF cannot load file in Meshes\Em_kids\em_tk_Sandbox2.NIF.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_kids\mel_playgr5.nif cannot load file in Meshes\Em_kids\mel_playgr5.nif.
Will use the default object Marker_Error.NIF.
Not able to find Foot part in BC_shoes_common_4.
Not able to find Foot part in BC_shoes_common_4.
Not able to find Foot part in BC_shoes_common_4.
Not able to find Foot part in BC_shoes_common_4.
Not able to find Foot part in BC_shoes_common_4.
Not able to find Foot part in BC_shoes_common_5.
Not able to find Foot part in BC_shoes_common_1.
Model Load Error: Meshes\Em_kids\1em_child_de_115n.NIF cannot load file in Meshes\Em_kids\1em_child_de_115n.NIF.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_kids\1em_child_DEh115a.NIF cannot load file in Meshes\Em_kids\1em_child_DEh115a.NIF.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\rt\rt_skinc_de_UT.nif cannot load file in Meshes\rt\rt_skinc_de_UT.nif.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\rt\rt_Shorts_b.NIF cannot load file in Meshes\rt\rt_Shorts_b.NIF.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_kids\WAR_COM_THEM3.NIF cannot load file in Meshes\Em_kids\WAR_COM_THEM3.NIF.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\rt\LR_FHair08MWave2_HEyel2b.nif cannot load file in Meshes\rt\LR_FHair08MWave2_HEyel2b.nif.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\rt\rt_skinc_he_UM.nif cannot load file in Meshes\rt\rt_skinc_he_UM.nif.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\rt\rtbc_sh_c_01_M.nif cannot load file in Meshes\rt\rtbc_sh_c_01_M.nif.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\rt\RT_T_Pants1_M.NIF cannot load file in Meshes\rt\RT_T_Pants1_M.NIF.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\rt\rt_shoes_MWcom5.NIF cannot load file in Meshes\rt\rt_shoes_MWcom5.NIF.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_kids\1em_child_we_115a.NIF cannot load file in Meshes\Em_kids\1em_child_we_115a.NIF.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_kids\1em_child_WEh115a.NIF cannot load file in Meshes\Em_kids\1em_child_WEh115a.NIF.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\rt\rt_skinc_we_UT.nif cannot load file in Meshes\rt\rt_skinc_we_UT.nif.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_KC\emc_sh_c_03x_r_M.nif cannot load file in Meshes\Em_KC\emc_sh_c_03x_r_M.nif.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_KC\em_RT_shorts_g_m.nif cannot load file in Meshes\Em_KC\em_RT_shorts_g_m.nif.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Emma\1em_b_n_Dert_114d.NIF cannot load file in Meshes\Emma\1em_b_n_Dert_114d.NIF.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\FP\FP_BG_WE_f_Hair_5nk_DE.nif cannot load file in Meshes\FP\FP_BG_WE_f_Hair_5nk_DE.nif.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_kids\1em_roo_de1.nif cannot load file in Meshes\Em_kids\1em_roo_de1.nif.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_kids\1em_mshirt_4_c_C.nif cannot load file in Meshes\Em_kids\1em_mshirt_4_c_C.nif.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\rt\rt_sandals1.NIF cannot load file in Meshes\rt\rt_sandals1.NIF.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_kids\1em_IM_115RT_23.NIF cannot load file in Meshes\Em_kids\1em_IM_115RT_23.NIF.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_kids\1em_Br_IBG_Hair115k.nif cannot load file in Meshes\Em_kids\1em_Br_IBG_Hair115k.nif.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\rt\rt_skinc_im_UT.nif cannot load file in Meshes\rt\rt_skinc_im_UT.nif.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\rt\rtbc_sh_c_03_M.nif cannot load file in Meshes\rt\rtbc_sh_c_03_M.nif.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_KC\embc_sks2_c_04.nif cannot load file in Meshes\Em_KC\embc_sks2_c_04.nif.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\rt\rt_sandals1_S.NIF cannot load file in Meshes\rt\rt_sandals1_S.NIF.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_kids\1EM_DERT_02_2bDE.NIF cannot load file in Meshes\Em_kids\1EM_DERT_02_2bDE.NIF.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\FP\FP_f_BG_Bret_Hair01k_DE.nif cannot load file in Meshes\FP\FP_f_BG_Bret_Hair01k_DE.nif.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\rt\rt_skinc_de_UM.nif cannot load file in Meshes\rt\rt_skinc_de_UM.nif.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\rt\rtbc_sh_c_02tt_M.nif cannot load file in Meshes\rt\rtbc_sh_c_02tt_M.nif.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\rt\rt_pants_MW32.NIF cannot load file in Meshes\rt\rt_pants_MW32.NIF.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\rt\rt_shoes_MWcom1.NIF cannot load file in Meshes\rt\rt_shoes_MWcom1.NIF.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_kids\1em_child_he_115b.NIF cannot load file in Meshes\Em_kids\1em_child_he_115b.NIF.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_kids\1em_child_HEh115a.NIF cannot load file in Meshes\Em_kids\1em_child_HEh115a.NIF.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\rt\rt_skinc_he_UT.nif cannot load file in Meshes\rt\rt_skinc_he_UT.nif.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_KC\emc_sh_c_03bl1a_M.nif cannot load file in Meshes\Em_KC\emc_sh_c_03bl1a_M.nif.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_KC\emc_sks2_c_bl_G.nif cannot load file in Meshes\Em_KC\emc_sks2_c_bl_G.nif.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_kids\1em_bear2a.nif cannot load file in Meshes\Em_kids\1em_bear2a.nif.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_kids\anim_dynamicdance.nif cannot load file in Meshes\Em_kids\anim_dynamicdance.nif.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_kids\1EM_BRt_115_08_02.NIF cannot load file in Meshes\Em_kids\1EM_BRt_115_08_02.NIF.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_kids\1em_child_SS_bmh_3y.NIF cannot load file in Meshes\Em_kids\1em_child_SS_bmh_3y.NIF.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_KC\emc_sh_c_04r_M.nif cannot load file in Meshes\Em_KC\emc_sh_c_04r_M.nif.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_kids\1EM_BRRT115_02_2.NIF cannot load file in Meshes\Em_kids\1EM_BRRT115_02_2.NIF.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_kids\1em_Br_BG_Hair115r.nif cannot load file in Meshes\Em_kids\1em_Br_BG_Hair115r.nif.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_KC\emc_sh_c_02rr_y_M.nif cannot load file in Meshes\Em_KC\emc_sh_c_02rr_y_M.nif.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_KC\emc_rt_p_br_21.NIF cannot load file in Meshes\Em_KC\emc_rt_p_br_21.NIF.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_kids\1EM_BRt_115_08_02.NIF cannot load file in Meshes\Em_kids\1EM_BRt_115_08_02.NIF.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_kids\1em_child_SS_bmh_3y.NIF cannot load file in Meshes\Em_kids\1em_child_SS_bmh_3y.NIF.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_KC\emc_sh_c_04r_M.nif cannot load file in Meshes\Em_KC\emc_sh_c_04r_M.nif.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_kids\1EM_BRRT115_02_2.NIF cannot load file in Meshes\Em_kids\1EM_BRRT115_02_2.NIF.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_kids\1em_Br_BG_Hair115r.nif cannot load file in Meshes\Em_kids\1em_Br_BG_Hair115r.nif.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_KC\emc_sh_c_02rr_y_M.nif cannot load file in Meshes\Em_KC\emc_sh_c_02rr_y_M.nif.
Will use the default object Marker_Error.NIF.
Model Load Error: Meshes\Em_KC\emc_rt_p_br_21.NIF cannot load file in Meshes\Em_KC\emc_rt_p_br_21.NIF.
Will use the default object Marker_Error.NIF.
Texture "Textures\Tx_BC_rock_03.tga" count 3.
Texture "Textures\_land_default.tga" count 3.
Texture "Textures\menu_thick_border_bottom_right_corner.dds" count 2.

The MCA errors will either be caused by an add-on patch made for an earlier version, or you don't have Westly's Master Headpack installed (as explained in the readme).

At least, that's the cause of 99% of MCA errors. I could be wrong.

EDIT: Yeah, it's the 'Hold It' add-on. It's not compatible with the latest MCA. Can't help you with the Children of Morrowind errors though.

OH I'll have to pull that off then since it is minor. The CoM Errors as far as I can tell are what is crashing the game, I can't bring myself to play MW without it.

Edit: I took the hold it add on off and it fixed the MCA issues as far as I can tell. Maybe I'll try and reinstall CoM and I'll see if that works.

Did you register the CoM .bsa in the ini file?

No I totally forgot about that! it's been a few years.