Erp.BO.PartSvc/Update Please contact your system administrator

I can’t seem to get my payload to succeed through RESTSharp. I get the error, “Something went wrong. Please contact your system administrator.” I get the object either by a duplicate method, getbyid, or getnew. If I output the object to a console window and paste into the RestHelp interface and it works just fine. Has anyone else had this problem? I switched to using UpdateExt which seems to be working, but I want to use the proper Update method.