I have children but GTP did not allow me to claim an exemption for them, why not?

The eligibility to claim an exemption for a spouse and/or dependents (children) is very limited for Nonresident Aliens. Only individuals from the following countries in limited situations may claim an exemption for a non-working spouse and/or dependents (children): American Samoa, Canada, Mexico, and Students from India (F-1, J-1, M-1 or Q-1 Student immigration statuses only).