Next chapter Coursepress not working correctly

Dear WPMUDEV,

I have no clue how it happend, but next to the problems i experience with the withdraw button firing wrongfully.. since a few weeks my "next" in course units does not function..

I get this message in the console when i press it:

resource interpreted as Document but transferred with MIME type application/json: "https://www.gbsgprogram.com/course/market-analysis/units/background-2/".

VM9103:2 Uncaught SyntaxError: Unexpected token W in JSON at position 1
at JSON.parse (<anonymous>
at front.js?ver=2.0.2:741
(anonymous) @ front.js?ver=2.0.2:741

I opened up support..

Hope we can fix it.. I need to go live in 1.5weeks XD

Greetings,
Simon