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Refresh error. Log shows .NET issues

We have a reports which refresh worked well on PBRS january 2020 version. After the may 2020 update, it stopped to refresh. The log error message says:

 

|Error Processing Data Model Refresh: SessionId: xx, Status: Error Failed to refresh the model, Exception Microsoft.AnalysisServices.OperationException: Failed to save modifications to the server. Error returned: 'This feature requires installing a newer version of the .NET framework. To use it, you must install at least 'Microsoft .NET Framework 4.5': https://go.microsoft.com/fwlink/?LinkId=528259. The exception was raised by the IDbCommand interface.

 

We run it on a Windows 2012 Server with .Net 4.8. The report refrehs flawless on the PB Desktop.

 

Any hint?

 

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