Can anyone help me with this problem?

When I try to add the app "Google Cloud Translate by RyStudio" as a "translation memory" in Studio, this happens: After filling in all appropriate details and clicking OK, I get this message:

"The translation provider 'Prompsit MT' could not be opened and has been disabled."

So in the end I uninstalled Prompsit. But that did not help! I still get the same error message! (I uninstalled via Studio's Sdl Plugin Management window, since I could not find it in the file manager.)

How can this happen? And what can I do to prevent it? (I should add that when I tried the RyStudio app before -- although quite some time ago -- this did not happen, even though I believe I had Prompsit installed as well.)

Mats

PS. I have already written to the providers of both apps about this, and neither of them has heard of it before, nor do they have any idea of why it happens.