Thank you Nawal for your reply.
Where is the part 6 of the form you mentioned ?
Also is there a way to get a taxpayer's signature online before Efiling ?
The name in the "Print name" field on the Authorization form is exacty the same as the name I mentioned in the Identiication field,
but in the address area, I put c/o. Is this the reason why I got this error ?
Thank you.