How to tell the robot if error occur?

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Hello guys

I want to tell the robot that if an error occurs, then show the message box and ask the user to try again. However, I am confused about how to write the expression in the if…then activity. Can anyone help? Thanks!

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@CHAN_Hiu_Fung_Victor_Stud

if you surround the sequnce qith try catch…the robot enters catch block only when there is an error and no need of if again

cheers

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