This theme needs updating, as it is missing the report.php.
You can fix this however, if you have access to the config.php for this theme.
add this to the end of the list which looks similar to this code. Make sure you add it after the last bracket and comma ( , here--->>> and befor the final bracket and semi-colon (;
// The pagelayout used for reports
'report' => array(
'file' => 'report.php',
'regions' => array('side-pre'),
'defaultregion' => 'side-pre',
),
That done, now download the report.php which I have attached to this comment, and add to your Darkb layout folder.
Now one last thing before you see it is working or not, in Site Administation > Developement > Purge all caches in the page which opens sellect Purge caches and OK now go back to your grader report page and refresh your browser window and you should see a better layout.
HTH
Mary