File 'JDocumenterror' containing class 'JDocumenterror' not found - php

Question

I have integrated two applications,one developed using Joomla and other using php mvc.When submit a page in the second aplication it shows
"File 'JDocumenterror' containing class 'JDocumenterror' not
found"
and does not redirect to the intended page.What can be done to remove this error?
Model:
function addPolicy($post)
{
array_pop($post);
//$this->printr($post);die();
$policyBreakDown = $post['rtcPercentage']."_".$post['CecPercentage']."_".$post['partnerRTCPercentage']."_".$post['translationPercentage']."_".$post['otherRTCPercentage'];
if($post['policy_for']<>'DL'){
$getOtherPolicy = $this->getPolicyType($post['policy_for']);
//print_r($getOtherPolicy);
foreach($getOtherPolicy as $data){
$othPolicyID[]=$data->policy_id;
}
if(count($othPolicyID)>0){
//foreach($othPolicyID as $k=>$v){
$ids = implode(",", $othPolicyID);
$data = array("status=0");
$this->updateSQL('tbl_policy', $data,
' policy_id IN ('.$ids.')');
//}
}
}
$id = $this->insert('tbl_policy',array('title'=>$post['title'] , 'description'=>$post['description'] , 'status'=>'1','break_down'=>$policyBreakDown,'policy_for'=>$post['policy_for']));
return $id;
}
Controller:
if(isset($_POST['AddPolicy']))
{
$id = $this->Model->addPolicy($_POST);
$this->redirect('?policy&pg=policy_manage');
}