Awesome app, Plug-In problem in GarageBand 10.1.1 & 10.1.2 (FIXED!)

I love this app, the sound banks and presets are very impressive, and the Plug-in works great in Logic Pro X, but throws up an error message reading “The Audio Unit NLogPoly Sy could not be loaded for your project, and may need to be updated….” in the latest two releases of GarageBand. I have tested this on 3 different Macs with the same results. Have deleted and re-installed the Plug-ins without success.

UPDATE: Found the fix today in an article on sweetwater.com…

If you are getting an error message in GarageBand which prevents the plug-in from loading, 1) Quit GarageBand, 2) Open your ~/Library/Caches/AudioUnitCache/ folder, 3) Delete both com.apple.audiounits.cache and com.apple.audiounits.sandboxed.cache, and 4) Re-launch GarageBand.

This will force GarageBand to re-validate the plug-ins, after which the NLogPoly Synth plug-in will load again without issue.

Will also note for users who say the app crashes on launch under El Capitan that they should delete it and re-download the application. If you have paid for it once, you will not be charged again, even though the App Store says it will cost $11.99.

bakeneko about NLogPoly Synth, v5.3