You are using the latest version of Power BI. We encountered some issues that were resolved by updating Power BI, so I wanted to confirm that you have the most recent version.
I hope updating the data gateway will solve the issue. Please ensure you have admin rights to the data gateway. If this doesn’t resolve the problem, we have two additional options to try as a last resort.
Option 1
You can clear the contents of the following folders:
For the Windows Store-installed app:
Delete the contents of this folder:
%userprofile%\Microsoft\Power BI Desktop Store App\ExtensionCache
For the Power BI Desktop installed using the offline/web installer:
Delete the contents of this folder:
C:\Users\<username>\AppData\Local\Microsoft\Power BI Desktop\ExtensionCache
Option 2
Clear the directory:
C:\Users\<username>\AppData\Local\Microsoft\Power BI Desktop and then try again.
If you are concerned that this may delete too much data, you can make a backup of all the folders in that directory by copying them to a different location before clearing it.