Are you including the debug version of the jquery library or the min version? I ran into this problem and found the solution to be a bit strange, but I received this error when using jquery-3.1.0.js and it ran perfectly when using jquery-3.1.0.min.js. I doubt you'd be using the .min.js for one form and the debug version for another, but I thought it was worth sharing my solution in case that's what you are doing.
It's worth noting that even when I included the min.js version in my Content Editor web part, it would still give me the error if I had the debug version included in my master page, since it was loading them both.