DataSource.Error: The Downloaded data is HTML, which isn't the expected type

Hi max0578 ,

Here are some suggestions to help you solve the problem:
1. Please check the data source url and data source credentials. Please make sure the url is correct and pointing to the data and has the required permissions to access the data.

2. Please check the gateway configuration. If the data source requires a local data gateway, make sure the gateway is online and configured correctly. The gateway must be in a normal state for the data to be refreshed.

3. Here are some links that are similar to your problem.
DataSource.Error: The downloaded data is HTML, whi... - Microsoft Fabric Community
Solved: The downloaded data is HTML, which isn't the expec... - Microsoft Fabric Community

If the problem persists, please provide more details such as what type of data source is being used and relevant screenshots to better help you resolve the issue.

Best Regards,

Clara Gong

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.