Upgraded to Monterrey, Using photos to upgrade iPhoto Library but ends with "The library could not be opened. Photos was unable to open the library "iPhoto Library". (3127)"
Working iPhoto library in High Sierra
Upgraded to Monerrey
Using Photos with option key to convert iPhoto library
It started the process, created a new directory called iPhoto Library.photoslibrary_prepare
but then ends with the error
"The library could not be opened. Photos was unable to open the library "iPhoto Library" (3127)"