Data source error: The 'Rollup1' column does not exist in the rowset.

I made a few updates to a Report and published to PBIRS but am getting the error below when I schedule a refresh of a report in Power BI Report Server. The exact same report connected to the exact same source refreshes perfectly fine in Power BI Desktop. The column Rollup1 exists in the source too. 

I've tried renaming the report, creating a new schedule etc but nothing has helped. Anything else I can/should try to get to the bottom of this? 

SessionID: fe6d0f00-da30-4860-9ad5-e373bad5a4f3
[0] -1055784784: The 'Rollup1' column does not exist in the rowset.
[1] -1055784932: The command has been canceled.. The exception was raised by the IDbCommand interface.
[2] -1055784932: The command has been canceled.. The exception was raised by the IDbCommand interface.

After restoring the old report and refreshing I am getting the error below

SessionID: c92b3022-d39e-4140-a350-9bd58714833a [0] 0: Refresh on Analysis Services Server failed with exception: {0}

 Im completely at loss as to what else to try right now!