Attempt to invoke virtual method 'java.lang.Class java.lang.Object.getClass()' on a null object reference

Can I ask how to solve this ? my code can run, it can show everythings I code, and no anyproblem already, but still got this problem.

final_val (3).aia (35.8 KB)

my version is 2.70

Are you using any extension?

I see a Lists extension.

When/where does the error occur?

Yes, I am using a extension List

Yes, I using the extension of List

Thank you for the solution!

what solution?

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