I AM UN ABLE TO MAKE VOICE CALL FROM YAHOO MESSENGER WHY? WHEN I AM TRYING TO CLICK IT SHOWS THE MESSEGE "XYZ?

wHILE TRYING TO MAKE A VOICE CALL MESSEGE IS SHOWN NEAR THE MICROPHONE ICON " XYZ (TO WHOM IWANT TO GIVE A VOICE CALL) CONFIGURATION DOES NOT MATCH" IS ANY SOLUTION AVAILABLE ?