Hi Nittin,
For the snapshot file, you have to specify the step size which represents the interval between each snapshot of the population.
Usually it is advised to set the interval as the number of individuals born in the feedback task.
E.g.
Dexen> gjsf 1 g:\snapshot.csv 10
Make sure that all your file and folder names do not contain any spaces. This is the problem in the gjof command in your screenshot.
A valid command with valid arguments could be as follows:
Dexen> gjof 1 g:\output.txt
Regards,
Cihat