Package Fail: Assertion failed: Pair != nullptr

I had some trouble packaging my project. I found out, that I’d would have trouble with some blueprints and I Managed to find out, that it was my levelblueprint, in which I started my Game and opened up my Main Menu. I need to find the failing variable. Pls Help me. If you need more logs or stuff just write it in an answer
my log: http://www.directupload/file/d/4408/89ttlf5b_png.htm
my level blueprint : http://cloud.directupload/4Nuk

Hmmm for experiment try changing widget you adding in viewport

Hello Pereansie,

I have a few questions for you that will help narrow down what issue it is that you are experiencing.

Quick questions:

  1. Can you reproduce this issue in a clean project?
  2. If so, could you provide a detailed list of steps to reproduce this issue on our end?
  3. Could you provide screen shots of the widgets that you are having issues with?
  4. Could you provide your complete logs via google drive or dropbox?

Hello Pereansie,

We have not heard back from you in a few days, so we are marking this post as Resolved for tracking purposes. If you are still experiencing the issue you reported, please respond to this message with additional information and we will follow up.

Thanks