Hi,
The Canada Post plugin is designed to display the "statusCode" from the Canada Post API and to also display the corresponding Message (right just after the error code).
Without the message we won't be able to know what the status code is for ; only Canada Post is able to tell you that.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.