math variables

I want to have a few incrementing record ID numbers. Am I supposed to use a string variable to hold numeric values? When I try to add 1 for the next record number, I’m getting the error “Missing Parameter: num1” even though I put a zero in my string variable. If I use an object type variable instead, I have the problem that I can’t give it a starting value and I still get the error that I haven’t given a value for num1.

How is this supposed to work?

Never mind. It works now. Don’t know why, but I’m no longer getting the error of num1 not having a value.

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