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I am running Mojave on a MacBook Pro 2012. When I try to launch GarageBand I get a message "Instrument Library is invalid!" I'm not finding any folder that is called "Instrument Library" or anything similar. The next step appears to be to reinstall GarageBand or delete its preferences. How do I do this? Thank you for your suggestions.
MacBook Pro 13″, macOS 10.14
Usually the library is here:
Where is my sound Library? - Apple Community
You might also follow some of the tips here:
launching garage band
