{"code":5,"message":"Invalid URL Passed"}

My Code is as follows...

public function zoho_email($array){		
		$data = json_decode($array,true);		
		$url = '/invoices/'.$data['invoice']['invoice_id'].'/email';
		//echo "<pre>"; print_r($data);die;	
		$recivers[] = 	array($data['invoice']['contact_persons_details'][0]['email']);
		$data = array(
			'to_mail_ids'				=> $recivers,
			'subject'					=> 'Invoice from MSL (Invoice#: '.$data['invoice']['invoice_number'].')',
			'body'						=> 'Dear Customer,<br><br><br><br>Thanks for your business.<br><br><br><br>The invoice '.$data['invoice']['invoice_number'].' is attached with this email.You can choose the easy way out and <a href="https://books.zoho.com/SecurePayment?CInvoiceID=d">pay online for this invoice.</a><br><br>Here&rsquo;s an overview of the invoice for your reference.<br><br><br><br>Overview:<br><br>Invoice # : '.$data['invoice']['invoice_number'].'<br><br>Date : '.date('M d, Y').'<br><br>Amount : '.$data['invoice']['sub_total'].'<br><br><br><br>was great working with you. Looking forward to working with you again.<br><br><br>\nRegards<br>\nMSL<br>\n',
			'send_from_org_email_id'	=> true
		);		
		//$data = array('contacts' => $contacts);
	 	$result = $this->zoho_create($url, $data);
		echo "<pre>"; print_r($result);die;			
	}

public function zoho_create($url,$array){	
		$json = json_encode($array);
		$data = array('authtoken' => ZOHOAUTHTOKEN,'JSONString' => $json,'organization_id'  => ZOHOORGNISATIONID);
		//echo "<pre>"; print_r($data);die;			
		$curl = curl_init($this->apiUrl.$url);
		if($url=='contacts/'){
			curl_setopt_array($curl, array(
				CURLOPT_POST => 1,
				CURLOPT_POSTFIELDS => $data,
				CURLOPT_RETURNTRANSFER => true
			));
		}
		else{
			curl_setopt($curl, CURLOPT_VERBOSE, 1);
			curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
			curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE); 
			//curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
			curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query($data));
			curl_setopt($curl, CURLOPT_RETURNTRANSFER, TRUE);
			curl_setopt($curl, CURLOPT_POST, TRUE);
			//curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-Type: application/json") );
			curl_setopt($curl, CURLOPT_HTTPHEADER, array("Content-Type: application/x-www-form-urlencoded") );			
		}
		$response = curl_exec($curl);
		curl_close($curl);
		//var_dump($response);die;		
		return $response;
	}

Please Help me...