Issue with generated data

Hi,

I just started using the generate data feature and it seems there is something I'm missing. I was able to generate a table of 12 columns and 2000 rows, I customized each column and everything looks fine in the variables tab.

Then I tried using the data in a recorded test case, by selecting the variable and the specific column I need for each field. None of the fields are being filled and I got the Exception in Test log:

'A row index must be an integer value'

Any idea what could be wrong here? thanks!