Hi,
I am getting the same message for what seems to be a fairly random subset of variables specified in the same way. I tried deleting the data as suggested and then running through the experiment with the control+ arrow key to proceed and still this error crops up. I even tested the files on a different computer. The data is written in separate text files. The file type is essay and I tried both with write as text and without and no luck. I am running the 2008 version of Medialab on an IMac running windows using bootcamp partition. Please help.
Thanks,
Ljubica