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Error - : "AnalysisServices: String reference not set to an instance of a String. Parameter name: s

Hello Guys, 
I have some datasets that I got from Analysis Service. I try to refresh those datasets and it gives me an error. This happens last Friday. Before that, it works totally fine.  I have the same Power BI version and the same dataset on my Laptop. It will refresh fine. This only effect on my Desktop. Please see below for the error.



I try to reinstall power bi, downgraded and try to install the latest version. Still not working. 
Can anybody please tell me what is this or is there anyone I can contact on Power BI technical side?  
Thank you 

Hi DHana,


Did you send any customized query to the Server?

How can I reproduce this issue?

Did you have the latest version of the Desktop?

It seems an issue of SSAS. Please refer to Forums/en-US and string-reference-not-set-to-an-instance-of-a-string.

If you'd like to contact Power BI tech, you can file a support ticket here.



Best Regards,

Community Support Team _ Dale
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
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Hi @Anonymous,

Open the application in the administrator mode and try to refresh. It will solve your problem.


Thank you,

Kantesh M

Helper II
Helper II

For some reason I cannot post an answer, so I'll keep it short this time. Just "Clear Permissions" HOME>Edit queries> clear permissions

This solved the same issue for me.  Thanks!

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