Colintree listview, Runtime Error: Attempt to invoke interface method on a null object reference

[careerdestacademy44 (CAREER DEST ACADEMY)]

Attempt to invoke interface method ‘android.app.Activity com.google.appinventor.components.runtime.ComponentContainer.$context()’ on a null object reference
Note: You will not see another error reported for 5 seconds.

[guri221111 (Sewak)]

Please add some photos,what’s your problem.

[netsolutions1 (Muhammed Rafeeq)]

Are you using colintree listview?

[careerdestacademy44 (CAREER DEST ACADEMY)]

[careerdestacademy44 (CAREER DEST ACADEMY)]

Yes using colintree listview
plz solution
this problem occer

[Vaibhav]

Can you show some related blocks? Most probably you are leaving some socket empty or you are passing empty data/string somewhere.

[netsolutions1 (Muhammed Rafeeq)]

I think its occurs when your placing initilize colintreelistview arrangement otherthan in initialize screen blocks. Check it…