Admin panel, Design - Content not working

[sneeks]

Whenver I click on the Design - Content option within the admin panel of my cart I receive a error message saying

"There has been an error processing your request

Please check error log for more info. You can check error log in the control panel if it is functional. Otherwise, refer to error log located in your web server"

Any idea why this is happening and how I can rectify the problem? Without access to the Content Manager I am unable to amend T&C details etc.

The error log says

"2013-07-24 16:37:41 - load error:  AbanteCart core v.1.1.6 Error: Could not create grid. Grid column model contains reserved column name ("parent"). in <b>/home/notjust/public_html/store/admin/controller/common/listing_grid.php</b> on line <b>101</b>"

Many thanks

[sneeks]

Problem solved, I downloaded the update file and replaced content.php.