First of all you might want to run Version Checker and see if any files need updates. And maybe just redownload the full Nexe mod.
Appo, Citadel, Hiigarans, Kadur, NGO, Valks
Yeah... I can see why you could end up with an error. These are VERY low quality mods that are buggy (and OP as all hell) and many times are not cared for by their modders.
I would remove these and see if you can run the game with Exi. If not you might want to add Torn Up Plenty, Mayorate to the list of excluded mods as well. If this fixes it, try finding the mod that creates issues with Exi and tell us here.
While the game might work with these mods without Exi running, they might have scripts or conflicts with Exi.
Another issue that could be causing this error is the using JRE 8. JRE is so buggy that Alex switched back to 7 after a brief use of 8. HOWEVER, this means that some of your mods will crash. Mainly Hiigarans and Kadur. Raccoon arms might crash as well