I'm getting this error since yesterday on a new dataset. It is a simple excel file table. I've done the following.
Signed out of Power BI Desktop and back in
Got the latest personal gateway
turned the gateway service off / on
republished multiple times during this process.
Others seem to be having the same issue. see thread here
There is a current support site error message, but it is specific to SharePoint as a data source only.
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