Please change the Permissions for the Adobe folder to complete Read & Write access, specially the following location.
Right Click Or Cmd+click on the Adobe folder
Click on Get info
Go to Sharing & Permission
Unlock the Pad Lock
Change all users to Read & Write Access.
Restart the System and try Open the Lightroom
Refer to the related link:Error changing modules
Let us know if that helps.
I get the same error since i updated to LR 6.3 !
Already changed permission as written above, but still the same error.
Removed preference file -> didn't help !
Tried new user -> still not working !
After deinstalling, installing 6.0 and then manual (not via application Manager) update to 6.3 its working again
We are glad to hear that your issue is resolved and thanks for sharing the solution as well.