Data error when attempting restructure

#1
I am aggregating and then restructuring my data set in preparation for
a repeated measures anova. I've done this before on another data set
without difficulty. Now, I find that I get the error message: "An
invalid index value was detected at case 1. String index values may
not be blank. Numeric index values must be non-negative integers." So it won't do the restructure.

I have looked at my data and I have no string data, and all of the
numbers in my numeric data are non-negative numbers.

What am I doing wrong? Any help appreciated!!!!
 
#2
Have you tried running summary statistics on the data table? Sometimes that will quickly identify numbers that are being read as strings or similar type issues.