The same thing happened to my sister when she was applying for the PR a while ago. IRCC emailed her and asked for an explanation. She explained that was an honest mistake. Now she is happily a permanent resident. Don't stress out. Just wait until you can provide them with additional documents/explanation letter.I just found that I forget to mention my previous refusal of US vistor visa, and people say it might cause misrepresentation and 5 years ban. I'm so stressful now. What should I do now?can I withdraw the application after receive AOR?or to send a webform to see if it's possible to correct it?please help guys...