Codeigniter Dropbox Upload

When I call function for file uploading in dropbox I getting error:

Message: curl_setopt(): The usage of the @filename API for file uploading is deprecated. Please use the CURLFile class instead

Part of code for curl from library is:

PHP Code:

private function _connect($url, $header, $request, $postdata = false, $destination = false)
    {
        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC ) ;
        curl_setopt($ch, CURLOPT_SSLVERSION, 1); // Require TLS
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
        curl_setopt($ch, CURLOPT_CAINFO, __DIR__."/certs/trusted-certs.crt");
        curl_setopt($ch, CURLOPT_CAPATH, __DIR__."/certs/");
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, $request);
        curl_setopt($ch, CURLOPT_HTTPHEADER, explode(self::LINE_END, $header));
        curl_setopt($ch, CURLINFO_HEADER_OUT, true);

        if(is_array($postdata))
        {
            curl_setopt($ch, CURLOPT_POST, true);
            curl_setopt($ch, CURLOPT_POSTFIELDS, $postdata);
        }
       
        $response = curl_exec($ch);
       
        if(self::DEBUG)
        {
            error_log(print_r(curl_getinfo($ch), true));
            error_log($response);
        }
       
        $code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);
       
        //If this is a content request write the file
        if($destination !== false)
        {
            //If the response was good then write
            //the file and return true
            if($code == '200')
            {
                $fh = fopen($destination, 'w');
                fwrite($fh, $response);
                if($fh !== false)
                {
                    fclose($fh);
                    return true;
                }
            }
            //The response was bad or the file couldn't
            //be written so return false.
            return false;
        }
        else return $response;
    } 


Any ideas?