Loading screen using movie player causes crash

Development Programming & Scripting C++
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1

I have been trying to implement a loading screen for loading between levels.
I have tried this old tutorial ~link~ but nothing displayed when I ran in standalone or even when packaged.
I also have tried using this plugin ~link~ and updated it to build with 4.26 and I still have the same result.

Seemingly nothing has worked and no one else has beable to point me in the right direction.
Is there something I am missing?

(edit) i got it to display how ever i get this crash log:

ue4 Assertion failed: IsInGameThread() || IsInSlateThread() || IsInAsyncLoadingThread() [File:Runtime\Slate\Public\Framework/Application/SlateApplication.h] [Line: 225]

2

Check out the loading screens in ARPG

3

thats the same system thing as the first link, i think its an engine bug since the same error comes up regardless of what plugin i use.

4

I found the solution, if you would like to fix this for 4.26 source and lower (not sure how far back) this is the solution from the unreal engine github commits. this is fixed already in 4.27.2+