first off, please format your code. To do so, put three backticks (```) before and after your code, it should even show you a warning if you don’t do that.
The reason why your code isn’t working is because you’re calling the service without data, so you tell it to select a source but not which one. Take a look at the documentation for the service call.
Also you probably want to use single quotes '.
The working automation should look like this: