CRA Result: Code 21

[MerinaBrisdon]

Hi,  I have tried 3 times to file my return but each time get the message.  "CRA Result Code:  21. The Canada Revenue Agency was unable to accept your return as your NETFILE Access Code did not match our records."  The Access Code entered is the same as the one I have used for the past two years.  What do I do now?   I only get 2 more chances to try. 

[TurboTaxSusan]

 The NETFILE Access code is not mandatory. You can try filing without it.