Narrow it down to which mod is causing the crash and then inform the modder of the issue. You really should use complex mods until the official editor is released.
Here's my load order, the ones highlighted in red are the ones I turned off when it was giving my problems. After they were turned off, things went fine, but now the issue has randomly arisen once more despite none of the 'red' mods having been turned back on.
Any .esm mods are suspect without a proper editor. Try remove that mod plus any associated mods.
Hey, that worked! Thanks a million!
However, that does beg the question, why was it working before, and what caused it to fail now?
Who knows? The code could have had one bad line, one incorrect command, one typo. When the code or subroutine was run, it caused a fatal error. Probably something like a bad mesh. That is why you shouldn't use mods until the official editor is released, so that you know they are 'clean'.
Yea be wary about using too many mods right now. The creation kit isn't out yet.
For Skyrim, it's best to not install/uninstall enable/disable mods mid game. IDK if FO4 follows this, but it is good practice to not add remove mods.