Mp3 Player Offline app error

I am using @The_Developer_2.0 Offline mp3 Player AIA but before Kodular update it works good but yesterday I change the color in screen but it is not working.
Screenshot Error

Aia file
MyMediaPlayerUpdat.aia (366.4 KB)

Please help me how can I fixed it.

You are trying to get the length of a array (maybe list) where the array (maybe list) is NULL


How can I fix it

Look through your code and see if it works like it should. Mika gave you the hint what might be wrong.

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Yes Peter is right take a look at your codes

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