org.openqa.selenium.InvalidSelectorException

OK.

You said you recently upgraded Katalon Studio from old 5.3 to 5.7. In between these two versions, there were a few significant design changes around TestObject. I suppose you should do ‘clean build’ from source to binary classes in order to make your project in sync with KS5.7 platform.

How to do ‘clean build’ ? It’s easy. Do as follows.

  1. stop your Katalon Studio
  2. in Windows Explorer, identify the /bin folder
  3. delete the bin folder
  4. restart Katalon Studio
  5. open your project
  6. run test in you project ---- all of Groovy sources will be re-compiled to generate new binaries
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