Not the error message, but the second to last line says it all: "Too many Alternate Animation groups overall (> 128)".  You have too many mods that use the FNIS Alternate Animations functionality. That is limited, and PCEA2 alone uses almost a third of the whole quota. Therefore removing some of the included PCEA2 subfolders already might solve your problem.   To figure out which of your mods use AA you need to look into the FNIS log file (temporary_logs\GenerateFNIS_LogFile.txt). L