Yes I also run into that issue when I attempt to run an iOS Mobile test. I believe this is because Katalon Studio doesn’t yet support appium 2.0 automatically. The only way I have been able to run tests with appium 2.0 is to use remote device execution. This means you will need to start the appium server separately through your terminal and then run a remote test instead. You will also need to add more information into the desired capabilities that are normally automatic when doing mobile tests including:
“appium:automationName” : “XCUITest”
“appium:deviceName” : “iPhone”
“platformName” : “iOS”
“appium:udid” : “your_device_udid”
There may be an easier way than I have found to start these tests but you can see another post of mine on how I did it.