I assume as you are asking what an SOP is, you didn't include one. This is a major part of the application. SOP (statement of purpose) outlines your family ties, reasons for coming to Canada (rather than any other country) etc. How much in total did you have to live on after paying your course fee's? You need at least 10k a year over and above them. Did you only ask for 2 years, or more?
I would also look at this link to see if your course is eligible for a PGWP.