Cornerstone App pop up errors


I'm struggling with a problem on the Cornerstone/CSOD App.  My Lectora 12 courses work fine in the browser version, but on the app pop up errors appear when the user submits the test for grading.  User has to tap OK through a multitude of these pop ups, the correct success or failure page appears & the score and status goes through fine for the learner's transcript.  It's just the pop ups that are causing the problem in the App version.  Any experience with this?  Screenshot attached.

Thanks, Holly