That isn't so much of an error. It is more a statement of facts.
1. Australia Post will not handle parcels with a girth > 140cm
2. The item(s) in your cart are (apparently) 27cm high and 54cm wide, which is giving you a girth of 162cm. (the 'x 2cm' in the error message is a bit misleading, it should be just 'x2').
If your item/product measurements are accurate then you'll need to use a different shipping method. If they are not accurate, then make them so.
Cheers
Rod
Bookmarks