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

[Anonymous]

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 

DHana 

[patoduck]

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

[soundguy2]

This solved the same issue for me.  Thanks!

[Anonymous]

Hi @Anonymous,

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

Thank you,

Kantesh M

[v-jiascu-msft]

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,
Dale