I also have both of these, the codjuice one hasn't affected anything as far as I can tell, but the USEC PMCs one has not allowed me to complete some quests.
At first I thought it was that the mod changed the spawn ratios for whatever reason, but seeing as other people are having this error, I changed my settings and went into a factory raid with bots turned up and noticed that usecs still didn't spawn.
Fin stated that these mod errors can appear as warnings and arent breaking anything.
nevertheless i tried different MODs now and got USECS and Bears spawned with better SpawnPlus.
As much as I like the tweaking from Fin, this stops from completing quests so .. unlucky i guess