The file "Assets.xcassets" couldn't be opened because you don't have permission to view it

Question

I'm developing a program in Xcode. For some reason, whenever I try to launch the simulator to view my app, the message: The file "Assets.xcassets" couldn't be opened because you don't have permission to view it. shows up. I tried looking online for solutions and tried the solutions in the following links: https://developer.apple.com/forums/thread/89197 https://codecrew.codewithchris.com/t/matchcardapp-mod-3-lesson-10-assets-xcassets-couldn-t-be-opened/5913 None of the solutions that were presented in these links worked. Does anyone know what could be causing this issue? Thanks.