hey guys some help i cant figure this out

i have checked my address using a online checker, and made 3 different wallets but none of my addresses work on theblockfactory website.
i have even sent BTC around my accounts and its worked, why does this it say invalid address when i enter it and go update settings.

my address: 1KhuxmYR52EE7E9ff86K6447ZojEXX4QJ3

thanks