Unable to Run the Web App

We have Web App Built in [Studio Web].
When Trying to Test on Cloud it generates the error displayed in the below attached image.

Steps to Publish -
Open the Web App in [Studio Web]
Then Click on Test on Cloud.

Observed Behavior -
After Clicking on Test on Cloud It just keep on loading for 1-2 minutes and Then Produces an Operational Error.

Expected Behavior -
The Web App should Open successfully in the Browser and we should be able to explore the functionalities.

Thank you. Please help me resolve me this error asap.

Is it still happening

That is resolved now.
But there are different issues now.