Kreporter-error: Unable to generate the reports

Undefined index: KReports in /modules/KReports/views/view.edit.php on line 97 , 100 ,130

$jsVariables .= ‘kreportAuthCheck=’’ . $sugar_config[‘KReports’][‘authCheck’] . ‘’;’;

In that , it gives the authCheck error. Do we need to give any credentials for this Kreport. I am unable to save the new reports and modules are also not loading. I gave the permission like,
chmod -R 775 cache custom data modules include upload themes
chown -R apache:apache .

I am using Suitecrm-Version: Version 7.3.1, Kreporter: V4.0 in Linux.

Please give me the solution.