Data Refresh Errors

malcolmph — Mon, 12 Jan 2026 23:51:47 GMT

i am very new to Fabric. i have a dataflow setup, with a semantic model and report which all works, however i am getting the following error on a dataflow gen2 scheduled refresh. The destination for the data is in Lakehouse. My only fix a the minute is to delete the table out of the Lakhouse and then it recreates automatically but subsequent refreshes fail.

Private data below replaced with xxxxxxxxxxxxxxxx

any help appreciated. i have tried deleting the tables and recreating but every refresh fails.

xxxxxx_WriteToDataDestination: There was a problem refreshing the dataflow: "Couldn't refresh the entity because of an issue with the mashup document MashupException.Error: Error in replacing table's content with new data in a version: #{0}., InnerException: #{0} failed to get contents from '#{1}'. Status code: #{2}, description: '#{3}'., Underlying error: AzureDataLakeStorage failed to get contents from xxxxxxxxxxxx. Status code: 409, description: 'The specified path already exists.'. Details: Reason = DataSource.Error;ErrorCode = Lakehouse036;Message = AzureDataLakeStorage failed to get contents from 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'. Status code: 409, description: 'The specified path already exists.'.;Detail = [DataSourceKind = "Lakehouse", DataSourcePath = "Lakehouse", DataSourceKind.2 = "AzureDataLakeStorage", DataSourcePath.2 = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxx", HttpStatusCode = 409, HttpStatusDescription = "The specified path already exists."];Message.Format = #{0} failed to get contents from '#{1}'. Status code: #{2}, description: '#{3}'.;Message.Parameters = {"AzureDataLakeStorage", "xxxxxxxxxxxxxxxxxxxxxxxxxx", 409, "The specified path already exists."};ErrorCode = 10266;Microsoft.Data.Mashup.Error.Context = User GatewayObjectId: b01b6364-d16a-4eaf-80d5-8e7a3c7b7348". Error code: 104100. (Request ID: 5c8f0582-c49c-46a0-9476-e05bec896ac1).

Re: Data Refresh Errors

vivien57 — Tue, 13 Jan 2026 08:41:55 GMT

Hello malcolmph ,

Do you have a "Replace" in "Update Method" on the Data Destination ?

Have a nice day,

Vivien

Re: Data Refresh Errors

Alven — Tue, 13 Jan 2026 14:58:06 GMT

Hi malcolmph ,

we are investigating the issue and will come back to you once we have more details.

Meanwhile, if your dataflow does not access on-premise data sources, you could try to not use the gateway and see if you are able to write to the Lakehouse.

Regards,

Alessandro

Re: Data Refresh Errors

malcolmph — Tue, 13 Jan 2026 19:12:42 GMT

yes i have replace

Re: Data Refresh Errors

Alven — Wed, 14 Jan 2026 08:13:51 GMT

Hi malcolmph,

we identified the root cause and we should have fixed it. Can you please try to refresh the dataflow again and let us know if the issue persists?

Thanks,

Alessandro

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