I don't have VFP8 yet. Which lines cause an error below?

Only one error occurs in VFP6.

>

>nx=0
>nx=NULL
>?TYPE('NX')
>?STR(nx)   && no error in VFP6...displayes NULL
>nx='c'
>nx=NULL
>?TYPE('NX')
>?STR(nx)   && this errors out...as it should
>

>