DataFlow possible bug?

majdkaid22, v-yuta-msft

I'm also having this exact error. This error started to manifest itself on 05 April 2019 for me. This is occouring on multiple reports and can be created on demand.

I have attempted the following in trying to resolve;

• Used the Merge Queries as New option rather than Merge Queries.
• Have the dataflow table load into memory by checking Enable Load option within Power Query Editor.
• Rebuilt the Dataflows.
• Rebuilt the report in the latest version of PBI Desktop (2.67.5404.981 64-bit (March 2019)).
• Confirmed the gateway is on the latest version (3000.2.52 (march 2019 release 2)).
• Removed the merge (obviously this works but is an unacceptable solution as I need that data merged).
• Re-entered credentials for the dataflow in PBI Desktop and on the Service.

Error as taken from PBI Service;

Something went wrong
Unable to connect to the data source undefined.
Please try again later or contact support. If you contact support, please provide these details.
Underlying error code: -2147467259 Table: NonVoice.
Underlying error message: The columns parameter must be null, specify the number of columns, specify a list of column names, or specify a table type.
DM_ErrorDetailNameCode_UnderlyingHResult: -2147467259
Microsoft.Data.Mashup.ValueError.Reason: Expression.Error
Cluster URI: WABI-US-EAST2-redirect.analysis.windows.net
Activity ID: 83703c77-276c-43e1-83ef-9790ea382b48
Request ID: ae46f037-b1dd-9558-316e-b59540007abf
Time: 2019-04-08 09:40:59Z