"Unknown error" - Meta Avatars not loading in unity editor

Hey, 
Suddenly, after we already had our meta avatars working properly we get some weird unknown error related to displaying our meta-avatar.

In function:
CoreAsyncInitialize() - we don't get ant response, and when the callback - "onComplete" is done, the data is also unknown.

Has anybody had some problems displaying the Meta Avatars lately ? 
It's doesn't work in our the unity editor.

Any answer would be appreciate,
Thank you
Mes