we encountered an unexpected Error when opening a dataflow

[Anonymous]

Unable to open a dataflow for editing.

Get the Unexpected error

and the "In progress" Wheel at the Mashup Text

The Dataflow Refreshes and I Can Access the Data Through PBI Desktop. 

However, this error Prevents me from working on or editing the Query 

I was able to Export the Flow - An Inport it into a new Workspace - I get the same Error

[Anonymous · Accepted solution]

I have discovered a Work Around

Instead of selecting Edit Tables (and getting the error) select Add Tables, add a Blank Query (power Query) you can then Save and It appears to restore Its self

you can then Go in and Delete your bank query Subsequently

[ChrisBurgessACT]

Looks like this has been resolved by MS.
No more unexpected errors. Nil code or environment changes this end.

[ChrisBurgessACT]

I getting this too. Same workaround. 
But have to add table each time i want to edit the dataflow. So the workaround is not fixing the root cause.

[ChrisBurgessACT]

Interesting in my case it appears to be 'erroring' when trying to open Dataflows that are not using a gateway (eg datasource https://api.powerbi.com/v1.0/myorg/admin/datasets), but happy to open/edit any dataflow that uses gateway.
Furthermore i can open/edit a gatewayless table dataflow by choosing one of the older table (queries) as entry point, rather than a newer (created) table as a entrypoint - no erroring.
So it appears to be affecting Dataflow tables created since last week where the dataflow does not use a gateway??
@Anonymous can you tell me your gateway/table scenario results?

[Anonymous · Accepted solution]

All Connections were to the gateway,

However I Too have not seen this reoccur in the last day or so - Seems Resolved 

[Anonymous · Accepted solution]

I have discovered a Work Around

Instead of selecting Edit Tables (and getting the error) select Add Tables, add a Blank Query (power Query) you can then Save and It appears to restore Its self

you can then Go in and Delete your bank query Subsequently

[TomMartens]

Hey @Anonymous ,

I recommend opening a support ticket with MSFT.

Regards,

Tom