Error: Cannot recognize one or more recipients or the address is invalid...

[Guest MonkeyJug]

...Would you like to send the message anyway - Yes or No?'

i've just recently experienced the message pop up EVERYTIME i try and send a text message - it's now really starting to annoy me!

does anyone know how to fix it, please!

the message sends fine when i click 'yes', but i have to do this every single time - even when i REPLY to a message that is already stored in my sms folder!