When I open the Export dialog, I get an error message that says "Class name cannot be empty." What does it mean?

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:bust_in_silhouette: Asked By Whom

After I moved my project folder to another location, I started getting “Class name cannot be empty.” error every time I open the Export dialog. I have no idea what it is related to. When I export my (Windows) project, I also get a message that says “rcedit (my export path)”. It is not an error and the exported game works fine. I also moved rcedit.exe to another location but I updated its path in Editor settings so it shouldn’t be the thing that causes the class name error. Only mention of “Class name cannot be empty.” can be found here but to be honest, reading that didn’t help me at all lol

Any idea what might be causing the error?