This is not an Error, it says mising data, means the user did not fill some form fields, here is the details

on this error and how to disable it in our FAQ forum, this topic:

Disable the default custom fields

http://www.mewsoft.com/cgi-bin/forum/forum.cgi?action=ViewTopic&Topic=1285&Forum=13&Page=1&Period=0a&Lang=English

The Auction and Classifieds products comes with default custom fields formats as a demo to show you hpw to use the custom

fields. If you load the default database after installing if you installed the product yourself or if we install it for you, when you

try to post an Ad or auction you will see few custom fields on the submit aution or Ad pages, these few fields also will display

on other pages like view ad or view item pages. To disable these demo fields, go to your admin center, click

on Custom fields Manager, then select Each format and on each format, click the "Edit" link for each field

and uncheck the box "Active". Normally there are 2 formate General and Computer you need to select each format

then edit the fields for each form

Mewsoft Support
www.mewsoft.com