public function startSession($domain) {
        $this->cookieLocation = str_replace('APP_ROOT', APP_ROOT, $this->cookieLocation);
        if (!is_dir($this->cookieLocation))
            mkdir($this->cookieLocation);
        if (!is_dir($this->cookieLocation)) {
            $this->error($this->error = "Can't create folder {$this->cookieLocation}");
        }
        $this->currentFile = $this->cookieLocation . date('YmdHis') . '-' . md5($domain);
        fclose(fopen($this->currentFile, 'w'));
    }