Refresh error with dataflows

[jasonlosser]

Several dataflows that have been successfully refreshing for the last month are now erroring out on refresh (on-demand and scheduled).

This is an on-prem source;  local .pbix files running the same scripts work fine, the dataflow also can refresh fine within itself, and all my other .pbix files in the service are refreshing.

My error:  

Error: An internal error occurred... RootActivityId = b4466dee-885d-4931-bfde-d69f2c925126.Param1 = An item with the same key has already been added. Request ID: 55aaa101-ddc6-8411-c899-99f26803ac29.

[v-shex-msft]

Hi @jasonlosser ,

Can you please provide more detailed information to help us clarify your scenario?(e.g. data source type, connection mode, data region your datasource host, detail error messages, gateway status...)
Regards,
Xiaoxin Sheng