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InvalidRequestContent error occurred("source" parameter is null)

I'm trying to run Power Automate Desktop with Power Automate.
I got an error like this.


    "message""The request content was invalid and could not be deserialized. The value cannot be Null.

It says that the "source" parameter is null, but I haven't created the "source" parameter.
I haven't even declared an Input variable on Power Automate Desktop.
What is the "source" parameter?
Where is it null?

Helper I
Helper I



be sure you are running the latest Power Automate Desktop version available. In case you're in doubt, download the latest one from here: It should be:


Let me know if it helped you.


Best regards,


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