Error with music player app

HI,
My self Dhayananth​:raised_hand_with_fingers_splayed::raised_hand_with_fingers_splayed:,
I am working in a Dynamic music player app but i get the following error both when i am testing and when I use the apk.

Blocks:
1.Screen1

2.Screen2


Aia file:MusicPlayer(1).aia (386.9 KB)

:pray::pray::pray:Thanks in Advance​:pray::pray::pray: