It only happens when your class curves plugin is on. I tried to see if I could find which Visustella plugin is the problem but the only one I can turn off that the error relates to is the EquipSetBonus one. When I turn that one off it gives the same error but with a different error log.

I tried changing the max stat limit in the CoreEngine back to the defaults but it's the same error. Also after disabling and re-enabling the EquipSetCore it no longer comes up in the error log and it's the same error log as the picture above.

Finally I tried updating all the Visustella Plugins with the most up-to-date ones and the same max call stack size error comes up but with a new error log. 

I don't even know what the problem could be now based on what the error is referring to. Now it just seems unrelated to me. Regardless of if you can actually do anything I just wanted it to be known that there's a compatibility issue.  I appreciate you getting back with me and looking into it. 

BTW, your Mobile Controls plugin was a life saver. Best of it's kind.