Hello, I experienced this error in an app I am developing after which I reproduced it in the ‘Weather Color Change’ app that is used as a tutorial/sample in the SmartThings documentation.
I changed one of the config options to select “multiple” switches. It seems that if you select multiple devices, it works fine, until you go beyond a certain number. At that point, you get this error (screenshots attached) that says “Network or Server Error occurred”.
When this happens, this are no log entries corresponding to this error in DEveloper Workspace log, nor a call is made from SmartThings cloud to my App’s backend. So the error occurs entirely within the SmartThings cloud perhaps.