I've never had this issue with Vurt's mod, but judging from the names of the meshes which failed, it isn't coming from the Leafy West Gash -- those look like Ascadian Isles meshes. Are you using Vurt's Ascadian Isles mod, as well? Perhaps a reinstall of that (or an update to his newest version) will help.
Additionally, unless you are using svn118 for the special release Knu made a while back, you should upgrade to at least svn126 (for a few important bugfixes and some extra functions, like water ripples). Newer than that, 161 and 178 are good stable revisions to use.
Lastly, it is always better to ask in the MGE thread for help -- more users tend to post in there so you have a better chance of a helpful reply, and if someone is having a similar issue, it can be helpful to know how others resolved it.
Good luck!