HELP PLEASE! If I do: DIM A[10] A[0]=5 CUSTOM A COMMON DEF CUSTOM D ?LEN(D) ?D[0] END It gives an error, why???

It's because you need to add the % to specifically define that it is an array So replace COMMON DEF CUSTOM D With COMMON DEF CUSTOM D%

?LEN(D%) ?D%[0] END

What's wrong with my code??? Thanks for the help.

This is the line saying type mismatch...

I think you should put DEF CUSTOM D[] and then operate with the array, because % is the suffix for integer.

You should send a public key, because the screenshots seem fine Advice: You should always use VAR after DEF, in this case for A because A could be another variable, putting VAR A after your DEF, would then create a new temporary variable named A.

Heres the key, hopefully you know how to use it! Thanks for the help.