If you are attempting to use the "send email" utility from Live access and receive this error when sending, you'll need to first configure your email settings in KC Desktop or correct them as they may be incorrect.
Please visit this link to learn how to configure KC desktop email settings.
IMPORTANT: Once you have emails configured for desktop KC, you will need to log out of Live Access and restart it on the database computer where KC is installed. On that computer, at the top of the screen, click on Utilities, Live Access, Restart Live Access. This makes Live Access use your email settings in desktop and will allow it to send emails.
If you do not do this step you will be unable to send emails through Live Access.