An error ocurred while processing ....

You could check the Issues forum here:

https://community.powerbi.com/t5/Issues/idb-p/Issues

And if it is not there, then you could post it.

If you have Pro account you could try to open a support ticket. If you have a Pro account it is free. Go to https://support.powerbi.com. Scroll down and click "CREATE SUPPORT TICKET".

Hi Anonymous ,

>The operation was throttled by Power BI Premium because there were too many datasets being processed concurrently. Please try again later.

Based on the error message, please try to set schedule refresh for different datasets at different times, and make sure that you are using the latest version of gateway. 

Here are some sources about monitor and optimize Premium capacities. You could reference them to have a try.

Monitor Premium capacities with the app 

Optimizing Premium capacities 

Monitor and Manage Power BI Premium Capacity 

The similar thread:

https://www.pbiusergroup.com/communities/community-home/digestviewer/viewthread?MessageKey=ae4d8ffb-1909-4111-8c1a-a8616873eb2c&CommunityKey=b35c8468-2fd8-4e1a-8429-322c39fe7110&tab=digestviewer

Best Regards,

Xue Ding

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

Hi Anonymous ,

Do you connect PDF file as a data source? I just find a known issue that customers with Premium Capacities using PDF file as a data source may see refresh failures.

If it matches your situation, please wait a few days patiently. Engineers are working on a fix, ETA will be updated here soon. If not, please view the documents above to optimize Premium capacities.