ExecuteQuery : Object reference not set to an instance of an object

I create a new flow with only one activity - ExecuteQuery.
When I test it, it show an error : Object reference not set to an instance of an object.

I try another flow, which could run well in the past, but now is also error.

What happen may be?

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@Rale Can you use Connect Activity and Check if you were able to Connect to Database using that Connection String, If No, there is a Problem in Connection String

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Thanks!
I checked the activity again and found that the password in connection string was wrong. lol

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