IRPA s. 11(1)A foreign national must, before entering Canada, apply to an officer for a visa or for any other document required by the regulations. The visa or document may be issued if, following an examination, the officer is satisfied that the foreign national is not inadmissible and meets the requirements of this Act.Read it on the Government of Canada's site
You will see A11(1) quoted in most refusal letters. On its own it is not a specific complaint — it is the provision that gives the officer the power to refuse when they are not satisfied.
Look past A11(1) in your notes to find the specific regulation cited beside it. That is the reason that actually matters.
These are the situations that most often produce this finding. Your notes will usually name the specific one.
Fix the thing the officer named. Changing everything else at once usually makes a file look staged.
Officers write several codes on one file, and only one of them is usually the real reason. Send us your notes and we will tell you which line actually decided your case — and what to do about it.