Try connecting to this URL (replace SERVER_URL with your url and CLASSNAME with the classname for the activity) and check if you can access the fields. If it works, you should see a list of cases in text format in your browser. If it does not work, then your class name might be incorrect.
I am getting below error. Pega 7.3 with Pega Robotics Studio 8
Unable to invoke robotic automation from this screen. The automation service is either unavailable or this system is not authorized to execute automations. You have the option of either quitting or continuing with your work flow.
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I am still facing the same issue "Error receiving data from pega" while trying to access robot activity fields on a local server - http://127.0.0.1:8080/prweb. However, it works if i use a remote server.