I've done as Bob said and updated my Canadapost.php, but I alwasy get this:
This is currently the only shipping method available to use on this order.
XML parsing error.
If you prefer to use canadapost as your shipping method, please contact the store owner.
Here is my setup:
Canada Post Parcel Service
Enable CanadaPost Shipping
Enter CanadaPost Server IP
Enter CanadaPost Server Port
Enter Selected Language(optional)
Enter Your CanadaPost Customer ID
Enter Turn Around Time(optional)