Client mail; empty body text

joomla 1.5
hikashop 1.5.1.

In the administrator menu, when I want to send a confirmation mail to a client the mail is sent, but without any of the order information.
More over in the mail menu I see an error message. See the attached image.
What could be wrong?

It's normal that the email is empty. It's a button to send an email to the customer about his order for any purpose. So you have to write it...
If you want to send an email with the order information, change the status of the order and you will be able to send a notification email with all the order information.

For the warning, it should not prevent you from using it (it's not a fatal error) and it is in a joomla file so hard to say anything about it.

Thanks for the quick reply. You were absolutely correct. Thank you! I've overseen the notification button.