the lightroom quit unexpectedly, and i had tried opening the app 20x, and it quits unexpectedly 20x also. what should i do? i am using mac.
Which version of Lightroom are you using?
Try signing out of Creative cloud and sign back in (if using Lightroom CC ) Sign in and sign out to activate Creative Cloud apps
Refer Lightroom: Basic troubleshooting to fix most issues
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