This pop-up error message appeared yesterday for one (and only one) of my UAD plugins.
Whether already being used in a track or in an attempt to add - as in the image I've provided.
I re-scanned my VST's in the plugin manager and it no only recognizes the mono guitar amp - which you still can't load.
I loaded Audacity & it reads both the UAD programs (mono/stereo) & loads them.
I subsequently uninstalled everything UAD & re-loaded.
Problem still persists.
Any thought, guys?
P.S. The only thing I was doing yesterday prior to this problem occurring was trying out some free plugins - Gsat I kept, others I uninstalled.