NAMSTRSUBSCHINT, Subscript #nnnn with value vvvv in name specification does not have a positive integer inside $C/$CHAR/$ZCH/$ZCHAR

GDE Error: This indicates that the nnnn'th subscript in a name specifies a string subscript using $CHAR/$ZCHAR but one of the arguments to this function (potentially in a comma-separated list) is not a positive integer.

Action: Specify the string subscript with a positive integer argument to $CHAR/$ZCHAR.

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