Strange problem after deleting material and meshes

Everything worked fine until I added some matrial and meshes and deleted them. When I press play I get:

And in debug there is:

It looks like it fails with the game instance but there is also that missing object. I have no idea how to fix this.

Took me a while but I found out what the problem was. I opened up my backup from yesterday and started replacing stuff and it worked. I noticed then that the backup had 2 files the new version didn’t have. I have no idea why they were missing they weren’t even shown in the content browser and I didn’t delete them. They just vanished and when I add them to the defect project it works again. I assume they are redirections to old files that I renamed since they only are 2kb in size and have the old filenames I used.

245351-fix.jpg

Edit: I have also found why they went missing UE deletes them when I press “fix up redirectors in folder”
I checked the project settings and UE set the game instance to none after using the “fix up redirectors in folder”.
I put in the renamed game instance and now everything works fine even when using “fix up redirectors in folder”.