Run time error in paint app

This is the paint app I developed using the MIT app inventor platform... when I open this application this runtime error message appears... What should I do?

@MariyamRiyas please provide .aia or complete image of the blocks

Rather not after opening, because I can see that I have managed to draw a line. Error appears while drawing?

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There is an undefined variable, most probably of an event.

Export your .aia file and upload it here.

Thank you so much. Got it solved.

Thank you so much for your response.

Was able to solve the problem by changing the blocks.

Appreciate your help.