The variable positions are not sequential. They must be in numerical order, as in 1,2,3,4, without skipping any numbers or with nothing out of order.
Explanation
The variable positions are not sequential. They must be in numerical order, as in 1,2,3,4, without skipping any numbers. Nothing can be out of order, as in 1,2,4,5.
User response
Make sure the variable positions are sequential.