@PrestigeZombiess I found a temporary fix to stop that error from happening,
Before doing anything backup your project files just to be safe (I believe this breaks Unreal Revision Control so do the old method of just copying and pasting the folder of the project i guess)
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Go to your Projects Folder And Find the .uefnproject file, rename the file to an appropriate name that abides the guidelines.
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Once you did that open it with notepad and make the “title” match it to the new name you set on the file.
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After that you will need to manually open the file in UEFN next time so just press the Browse… button in the project selector and manually find your project file.
That should fix the error from showing even after changing the project name, I’d still recommend avoiding using the word hell in anything that user’s might see in the map just to be on the safe side. Also Do not try to change the name on your World and Plugin as that might corrupt/break your project