I never thought I want to do my work desperately...
SKPARK
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case 1
in your asset folder, there could be a unnecessary files like (archive.zip but 'archive' in korean) that someone pushed carelessly. (maybe it is similar case that @regi9 said)
remove it and try to open your project
case 2
open finder
right click your project file (or control click)
select 'show package contents'
remove 'xcshareddata' and 'xcuserdata' folders
and test your project