It is also saying there is a problem allocating memory… are you trying to open your project on another machine? (One with less memory) How much memory do you have?
Besides that, I found an issue with 4.21 which made one level I created to crash on it but no other previous releases up to 4.17. This bug in particular seems to crash when you start the editor with the default editor map containing any actor which tries to access a non-ready resource in the constructor of that said actor. If this is your case, follow these steps:
- edit your config.ini and remove any default editor map written in there, left it blank
- start editor again and you might now be able to open your level again
- if all up to this point succeeds, you need to check each actor’s constructor at your level for that said non-ready resource being accessed
- the best way to check if an actors is to blame, is to unlink the contructor graph on it, then set the default editor map to your level again, close the editor and open it again.
I hope this helps!
PS: the description is happens on editor and was happening on packaged aswel, so the check for actors part should stay the same. The issue might happen frequently on slower machines.