Invalid form

[Jeremy2719]

I am currently trying to submit form IMM 5709 to my application to extend my study permit, however, when I try to upload the form I receive:
Error: We couldn't upload your file.

• Error Description:
  
  You have submitted an invalid form. Please complete and validate an electronic version of the application form, save it to your computer, and upload it.
  
  Note: You cannot submit an application form that has been scanned.
  
  You do not need to sign your application form. You must provide a digital signature once you are ready to transmit your completed application.
  

I have checked the form and found that nothing is out of place, all the info corresponds with the questionnaire I submitted. The form is also validated, it hasn't been scanned and all of it has been filled out electronically on the same computer which I am using to upload my form to my application.

How do I fix this and submit the form?

Thank you

 

[Jeremy2719]

Nvm, the problem resolved itself

I waited a few hours and tried it again and it worked

 

[Princess2020]

I am submitting imm5257e and 5257b for my sister in law but it says “ you have submitted an invalid form”. Any idea what the problem could be? 5257e is properly validated with barcodes.