Automate the fill in of an input based on another one using on change event with a microflow

Hello!   I'm trying to automate the fill in of the quarter in this page based on the month, so I added an event listener on change with a microflow to the input of month (month and quarter are of type enumeration) as you can see : The microflow : When I run the app and try to enter a month I don't get automatically the value of the quarter but I get an error message as you can see below :   Could you tell me why?  
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