Seems like you missed some information to enter in that form (IMM5532), check again. Also, they require hand written signatures in all the signature fields so make sure you sign them with hand, scan the documents and submit online.
You will have to resubmit the whole application on the PR portal again. I'd suggest you to re-download and re-fill all the documents again and check for all the signature fields, make sure you don't miss anything this time. Best of luck!