Messages app won't launch in Mojave
Late 2015 iMac 27", 3.3 Ghz i5, 24Gb RAM running Mojave 10.14.6 (merely to retain viability of Adobe software, due to my personal reluctance/abhorrence to paying exorbitant "subscription fees").
Messages suddenly ceased launching, returning message "macOS needs to repair your Library to run applications", then fails to accomplish anything but generate a problem/crash report "Messages quit unexpectedly". Clicking to reopen and generate a message to Apple simply repeats the cycle.
Followed earlier thread advice and DID find three missing fonts (restored), and deleted the referenced .plist... to no avail.
Your suggestions/solutions would be most gratefully appreciated...
iMac 27″, macOS 10.12