alchemy error when trying to use certain synths

I'm using OSX El Capitan version 10.11.3. 3.1 Ghz Core I5, with 16GB RAM, and 1TB Fusion Drive. My issue is in GarageBand 10.1.

When I select certain synths in GB I get the error below.

I have done research to try to get rid of the error by updating Alchemy or removing it so I don't keep getting the error. So far I haven't figured it out. Does anyone know how I can update to the newest version of Alchemy or remove alchemy so I can at least not waste time with the error popping up?

Thanks!