Bosch Classix 6 error message?

Hello, my Bosch Classixx 6 Express 1400 has for no reason refusing to work! It turns on ok when I rotate the dial but whatever program I select, the key symbol flashing, it beeps and " -0- " is displayed.

It's a couple of years old, out iof warranty, is not used heavily and I also use calgon with my washes.

Any advice as to what the error message is will be most helpful.

Thanks.