Hi,
there are serveral way to share the log(file).
I think you tried the "Share log" button and got that error msg. very untypical.
But Rimworld create a new player.log each start (button at the option for the file location).
But anyway,
XML error mosttime mean some typo/syntax error at a mod,
Exception is mosttimes complicated, maybe you miss a required mod or didn't load it before the mod which need it.
You can try to take a keyword from the error like "shuttlepersonalrace" and do a search at the Mods folder to find the mod.
My suggestion,
deactivate all mods (you can keep the libaries,harmony,hugslib,jecstools,Alien framework, other frameworks).
Then activate mods at small batches (5-10 or maybe more if you are sure they are errorfree).
When you don't got error's activate the next batch.
But when you got error's identify the mod.
Check the mod description if you maybe miss a required mod.
Check the mod discussion if error's are allready known ? If not ask there about the error then the mod author can deal with it.
Better don't use mod's that give out error's mosttime the mod don't work correct anyway and can cause more trouble later during gameplay which you can't fix.