INTP Error help needed

According to my manual(s), this is:

INTP-310 (%s^4, %d^5) Invalid subscript for array
Cause: KAREL program error. The index of the array is invalid.
Remedy: Check the length of the array and index value.

I doubt that is of much help, seeing as ATPASWRD is a Fanuc supplied program.

Edit: the manual is for R-30iA, just noticed that you mentioned R-J3. The message template also doesn't seem to match, so this may not be correct.

Quote from rf103

Edit: the manual is for R-30iA, just noticed that you mentioned R-J3. The message template also doesn't seem to match, so this may not be correct.

My R-J3iC manual has the same description.

Could this simply be that the password you are creating is too long!?