Cannot Render PBIX reports - Get An Error has occurred.

[sleddog77]

Today we have been getting the generic error -  "An error has occurred" when trying to render reports on power bi server.  I looked at the log files and I see a lot of "ERROR 53 OData exception occurred:  System.Net.WebException:  The remote server returned an error:  (401) Unauthorized." 

I have done a lot of research but I haven't seen anything that can help me.  Any help would be much appreci

[elMedex]

Having the same problem, I'm under the impression is something related with custom visuals and December update, but haven't found anything yet