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Hi,

I am not sure of the workaround in powerbi Service, but in PowerBI server I had the following observations.

Sometimes when you change the DAX queries, unfortunately, the report in the server doesn't grab up those changes, even if you have saved it (overwriting it). It will work for a few minutes, and then later show the error which we are talking about.

The workaround I found out was deleting the file in the server, and saving it in the same folder with the same name for that file after you are happy making the changes you have done to your pbix file. Also refreshing the data, and then saving/publishing it in case of powerbi service should also help. 

Thanks,

Modasher.