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error ” cannot connect to Katalon server”

When I use Object Spy, I have encounted an error " cannot connect to Katalon server. Make sure you have started Object Spy on Katalon application" after pressed "alt  + ~".


  • Yes, I did that. When I selected the browser (firefox), New window firefox  which embedded katalon javascript appeared. I saw the red Square, then I pressed “alt  + ~” ---> errror message "cannot connect to katalon server"

    Do I miss to set up anything?
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