fwrite(): Argument #1 ($stream) must be of type resource, false given

/data01/virt82355/domeenid/www.sportos.ee/www-sportos-eu/common/functions.inc.php1742fwrite
  /data01/virt82355/domeenid/www.sportos.ee/www-sportos-eu/common/DB.class.php194log2file
    /data01/virt82355/domeenid/www.sportos.ee/www-sportos-eu/common/DB.class.php324queryDB
      /data01/virt82355/domeenid/www.sportos.ee/www-sportos-eu/code_bw/sportos/sport/SP_Competition.class.php1249selectOneDB
        /data01/virt82355/domeenid/www.sportos.ee/www-sportos-eu/code_bw/sportos/sport/SP_Competition.class.php861registeredSP_Competition
          /data01/virt82355/domeenid/www.sportos.ee/www-sportos-eu/code_bw/sportos/sport/SP_Competition.class.php624_controlSP_Competition
            /data01/virt82355/domeenid/www.sportos.ee/www-sportos-eu/code/kernel/Application.class.php716controlSP_Competition
              /data01/virt82355/domeenid/www.sportos.ee/www-sportos-eu/code/kernel/Application.class.php441getContentApplication
                /data01/virt82355/domeenid/www.sportos.ee/www-sportos-eu/index.php225__constructApplication