I have been using Negative Lab Pro for the last few months and it has worked just fine. I don’t know if I potentially overwhelmed the software because recently I have been this message on my Mac whenever I try to activate the plug-in. Any help on how I could possibly resolve this.
This means there is some issue with Lightroom and your Apple Keychain. Negative Lab Pro relies on Lightroom to communicate with your Apple Keychain, so if something is stopping it from doing this, you may get this error and you may have Lightroom constantly asking you for your password.
Sometimes this seems to just resolve itself with a reboot, but another you can try is the recommendation from Adobe to resolve keychain issues:
Open Keychain Access, which is in the Utilities folder within the Applications folder.
From the Keychain Access menu, choose Preferences.
Click General, then click Reset My Default Keychain.
Authenticate with your account login password.
Quit Keychain Access.
Reboot your Mac.
Let me know if that helps or if you still have this issue.
BEWARE: Better read this before you reset your keychain…