postTopicReply function returns The submitted form was invalid. Try submitting again.

bbscraper.php

<?php
// base class with member properties and methods
class BBScraper
{

    var $baseUrl;
    private $user;
    private $sid;
    public $fetchedTopics = array();
    public $topicReplys = array();
    public $boardMembers = array();

    function __construct($baseUrl)
    {
        $this->baseUrl = $baseUrl;

    }

    public function login($user, $pw)
    {
        $this->user = $user;
        $base = file_directory_temp();
        $this->logout();
        if (file_exists($base . '/cookie.txt')) {
            unlink($base . '/cookie.txt');
        }
        $target = $this->baseUrl . '/ucp.php?mode=login';
        $d = $this->request($target);
        $html = str_get_html($d);
        $this->sid = $html->find('input[name=sid]', 0)->value;
        $fields = array(
            "username" => $user,
            "password" => $pw,
            "autologin" => true,
            "viewonline" => false,
            "sid" => $this->sid,
            "redirect" => 'index.php',
            "login" => "Login"
        );
        $d = $this->request($target, 'post', $fields);
        /**
         * @TODO Thow an error if we need to enter a captcha
         */
        return (strpos($d, 'You have been successfully logged in') > 0) ? true : false;

    }

    public function markForumAsRead($fid)
    {
        $this->request($this->baseUrl . '/viewforum.php?&f=' . $fid . '&mark=topics');
    }

    public function logout()
    {
        $d = $this->request($this->baseUrl . '/ucp.php?mode=logout');
        return $d;
    }

    public function postTopicReply($fid, $tid, $message, $subject = '')
    {
        $this->markForumAsRead($fid);
        $ref = $this->baseUrl . '/viewtopic.php?f=' . $fid . '&t=' . $tid;
        $d = $this->request($ref);
        sleep(1);
        $ref = $this->baseUrl . '/posting.php?mode=reply&f=' . $fid . '&t=' . $tid;
        $html = str_get_html($d);
        $form_token = $html->find('input[name=form_token]', 0)->value;
        $lastclick = $html->find('input[name=lastclick]', 0)->value;
        $topic_cur_post_id = $html->find('input[name=topic_cur_post_id]', 0)->value;
        $creation_time = $html->find('input[name=creation_time]', 0)->value;
        $data = array(
            'subject' => 'test 1 2 3',
            'message' => 'lorum ipsum',
            'creation_time' => $creation_time,
            'form_token' => $form_token,
            'topic_cur_post_id' => $topic_cur_post_id,
            'lastclick' => $lastclick,
            'topic_id' => $tid,
            'forum_id' => $fid,
            't'=> $tid,
            'f'=> $fid,
            'mode'=> 'reply',
            'sid' => $this->sid,
            /*'sid' => $this->sid,*/
            'attach_sig' => 1,
            'post' => 'Submit'
        );
        print_r($data);

        /**
         * Anti spam in posting.php
         * if ($cancel || ($current_time - $lastclick < 2 && $submit))
         */

        sleep(2);
        $target = $this->baseUrl . '/posting.php?mode=reply&f=' . $fid . '&t=' . $tid.'&sid='.$this->sid;

        // Init curl
        $base = file_directory_temp();
        $ch = curl_init();
        // Set options
        print_r('Posting to: ' . $target);
        echo "\n";
        echo "Post body: \n";
        $q = http_build_query($data, '', '&');
        //$q = "subject=Re%3A+Need+input+for+new+XPEnology+site&message=Working+on+hardware+DB23&creation_time=$creation_time&form_token=$form_token&topic_cur_post_id=$topic_cur_post_id&lastclick=$lastclick&topic_id=10895&forum_id=2&attach_sig=1&post=Submit";
        print_r($q);
        echo "\n";
        curl_setopt($ch, CURLOPT_URL, $target);
        //curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $q);
        curl_setopt($ch, CURLOPT_REFERER, $ref);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_HEADER, false);
        curl_setopt($ch, CURLOPT_HTTPHEADER,
            array(
                'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8',
                'Upgrade-Insecure-Requests: 1',
                'User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.111 Safari/537.36',
                'Content-Type: application/x-www-form-urlencoded',
                'Accept-Encoding: gzip, deflate',
                'Accept-Language: en-US,en;q=0.8,nl;q=0.6',
            ));
        curl_setopt($ch, CURLOPT_ENCODING, "");
        curl_setopt($ch, CURLOPT_COOKIEJAR, dirname(__FILE__) . '/cookie.txt');
        curl_setopt($ch, CURLOPT_COOKIEFILE, dirname(__FILE__) . '/cookie.txt');
        curl_setopt($ch, CURLOPT_COOKIE, dirname(__FILE__) . '/cookie.txt');
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);

        // Execute request
        $result = curl_exec($ch);
        curl_close($ch);
        // Get the result
        $html = str_get_html($result);
        $error = $html->find('.error', 0);
        //print_r(array('Response'=>$result));

        if ($error) {
            print_r($error->innertext);
            echo "\n";
            return false;
        } else {
            print_r('No error on submission. It possibly worked ');
            echo $html;
            return true;
        }
    }

    private function request($url, $type = 'get', $posData = null)
    {
        $ch = curl_init();

        //set the url, number of POST vars, POST data

        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_HEADER, 0);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
        curl_setopt($ch, CURLOPT_COOKIE, dirname(__FILE__) . '/cookie.txt');
        curl_setopt($ch, CURLOPT_COOKIEJAR, dirname(__FILE__) . '/cookie.txt');
        curl_setopt($ch, CURLOPT_COOKIEFILE, dirname(__FILE__) . '/cookie.txt');
        if ($type === 'post') {
            $fields_string = '';
            foreach ($posData as $key => $value) {
                $fields_string .= $key . '=' . $value . '&';
            }
            rtrim($fields_string, '&');
            curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
            curl_setopt($ch, CURLOPT_POST, count($posData));
            curl_setopt($ch, CURLOPT_POSTFIELDS, $fields_string);
        } else {
            curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');
        }
        //execute post
        $result = curl_exec($ch);

        //close connection
        curl_close($ch);
        return $result;

    }
}

function file_directory_temp()
{
    return ".";
}