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Seemingly out of nowhere, my Xcode (10.2.1) became unable to build or even index any single project I try to Run, even an unchanged "Single View App" preset. And my Xcode 11.0 Beta 4 crashes any time I try to open a file inside of a project. What should I check and/or try doing?

macOS Catalina (10.15 Beta)

EBDOKUM
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1 Answers1

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Just restart your computer, that is what helped in my case

EBDOKUM
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