Difficulty in Crash Course 11.5.5

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i follow this learning path https://gettingstarted.mendixcloud.com/link/module/328/lecture/2543/11.5.5-Configuring-Your-Widget-in-Mendix-Studio-Pro in direction 2, I encounterd this errors. How can i solve it?  
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1 answers
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you need to do 2 things:

  1. select the activity, right click and select error handling custom with rollback.
  2. Select the flow pointing downwards, right click, select set as error handler
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