My app seems to not want to work and I am not sure why, can anyone help me?

basicaly its a simple test quiz the slider determines the level of the question which at the moment only level 9 and 10 works with 2 questions each level. When i press the start button its suppose to get a question and a problem depending on the level it should display the first question but all it does is close the app

get an image of your blocks

get an image of your blocks (→ right mouse click in Blocks area)

Your global Current Grade Level is not being set to 9 or 10.

I advise switching from a Slider to a List Picker. You don't need to round their Selection value, you can set their Elements to exactly what you want, and you can use their .Text to show the Selection.