I receive a remoting exception when saving a new record in a table for Campaign Members. The only filter condition on the Campaign Member model is the Lead Id which is pulled from the url parameter. Updates work fine it is only new Campaign Records that produce this error.
This is occurring in our sandbox environment that is currently using Superbank - Patch 9 Version 6.8.20.
In order to take out any variables, I created a brand new page from scratch with only Lead and Campaign Member models. Same error occurred. See screenshot for reference.