The following error occurs when trying to run the installable cloud app.
Cause: The application has not been deployed against this Web APIs.
You probably has created multiple PowerServer solutions, hence multiple Web APIs.
You can access the API: api/Application/LoadAll to confirm. JSON strings similar to the following will be displayed. You can check the JSON string to see which application is deployed against which Web APIs.
Solution: You can modify the root URL of the Web APIs for an application. The Change the Web API URL section has detailed instructions.