This year we have to put info. exactly as it shows in SIN. Previous years we could put something in first name not this year.  Almost 90% new students we deal with have also put their info. in SIN and study permit as you have shown by putting full name in family name and leaving rest blank, I don't know if they don't understand this question when applying for student visa.

Try Efile with putting info. like this:

first name:  Leave Blank

middle name: Leave Blank

family name:   Parbh  Rajput (Put it exactly on SIN, if space between Prabh and Rajput then put space, if no space then don't put space)

Hope this helps.