The mostly likely reason for getting that message is that the address you're entering is NOT one of the 48 continental U.S. States.
We know it's frustrating, and we do apologize for the inconvenience. Unfortunately we have stopped shipping internationally due to the difficulty with many countries customs holding, returning, or even disposing of product.
It's possible there is something compatible that you can find locally, or online which you can order that you wouldn't have to pay international shipping for.
For further assistance contact us using the help form: