Dataflow Gen2 – Error 104100 after Save & Run (validation OK)

[mustaphaben]

Hello everyone,

I’m facing an issue with a Dataflow Gen2:

• Context

  • Connection created to a SharePoint folder.

  • Reading a CSV file from this folder.

  • Applied basic transformations in Power Query (filter file, import CSV, promote headers, change column types, rename columns).

• Observed behavior

  • Validation succeeds (Succeeded – last run 18/08/2025 at 1:47 PM).

  • But when I click Save & Run, I get the following error:

There was a problem refreshing the dataflow. 
Please review the error message(s) below, fix the problem, and try again. 
(Request ID: ae16c38e-2299-408e-ab65-c55da576880d)

Error Details: We encountered an error during evaluation. 
Unknown evaluation error code: 104100

• Question
  Has anyone already encountered this 104100 error in Dataflows Gen2 (validation passes but execution fails)?
  Is there a known issue or workaround when using CSV files from SharePoint?

Thanks in advance for your help!

[ChielFaber · Accepted solution]

check out an earlier post:

https://community.fabric.microsoft.com/t5/Dataflow/Unknown-error-DataFlow-Gen2-CI-CE-Preview/m-p/439...

or 

https://community.fabric.microsoft.com/t5/Dataflow/DataFlow-Gen2-104100-Couldn-t-refresh-the-entity-...

Hope this is helpfull