Ok, this is simple...
Make sure that there is nothing "new" in the mission file from TGE.
For instance maybe you are telling TT to use a file for the sky that it does not have...
This includes shapes, sky files, terrain files, etc... Everything in the mis file
Also, make sure you did not use any "new" textures in your terrain. TT will whine about that too...

It's that simple.

Also make sure the paths to these objects/skies (^^) are correct.
Maybe you use the TGE that is using the demo /data/shapes/Red/Tree01.dts
Then make sure that you edit all paths to game /data/.../.../...

Hmph. Try to host your mod whit console (dedicated)
And when you get auto-kicked from your server, look to the console.
look for errors (or copy the whole thing into here)