Internal Error loading Power BI visuals in Power BI Desktop after December 2020 release

[senzero]

Hello.  I've upgraded my Power BI Desktop to December release (2.88.802.0 (20.12) (x64)) and am now experiencing issues loading any visuals in my Power BI file that are using measures.  The error I am getting is: 

Error Message:
An internal error happened due to failed runtime assertion: AccessToken must be specified... The exception was raised by the IDbConnection interface.

My data model is using Power BI Aggregations feature.  I connect to Power BI Dataflows and they are set up as "Dual" storage mode.  I also connect to Azure Synapse data source using DirectQuery.  The aggregations are based on this source.

I am having to re-install the November release in order to continue working on the file but I'd like to resolve the issue somehow so that I can use the new features of the December release.  Any help or suggestions would be much appreciated.  Thanks!

[senzero]

Hi.  After some more testing, it seems it's related to Dataflow. It seems when I use import mode for the Dataflow table, everything is fine, but when I use DirectQuery mode it does not work properly.  Whenever I create a visual using a field from a DirectQuery table I get the error (as shown below).

Looking to see if anyone has any idea why this is happening? It works fine with the November release of the Power BI Desktop...

[rh203]

Hi, same issue here after updating to Dec 2020 release - worked fine on Nov release...

[Milan6687]

Even I am getting the same error.

[nicg]

I believe this is the same issue as reported here: DirectQuery Dataflows IDbConnection error 

[v-chuncz-msft]

@senzero 

A similar issue has been reported: CRI 220870379, so stay tuned. 

[v-chuncz-msft]

@senzero 

This should have been fixed in the latest version.

[senzero]

Hello.  Thanks.  I installed version 2.88.1144.0 and it's been working fine since.