Using variables to create a timer

Actions:


- Set variable (minutes) to value 4 [onShow]


- Substract 1 from variable (minutes) every 60 seconds [Timer]


- Change contents of timeText (my textbox to show time) to show variable (minutes) every .1 sec [Timer]


 - Add "minutes left" to variable (minutes) [onShow]


The timer says "Invalid" after the first minutes goes ends.

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