Callstack:

    » dependencies\init\Initializer::run_environment()
      (index @ 40)
    » dependencies\init\Environments::on_run(object(dependencies\init\Initializer), 1)
      (Initializer @ 253)
    » core\Router::start()
      (Environments @ 201)
    » core\Component::enter("'cms'")
      (Router @ 212)
    » components\cms\EntryPoint::entrance()
      (Component @ 115)
    » components\cms\EntryPoint::findPageUrl()
      (EntryPoint @ 132)
    » components\cms\routing\UrlFormatFactory::format("'\/viewtopic...6&t=38'", NULL, "false")
      (EntryPoint @ 361)
    » components\cms\routing\UrlFormatFactory::detect("'\/viewtopic...6&t=38'", "false")
      (UrlFormatFactory @ 23)

Report:

trace(1) #1 called in template @ 33:
object(exception\InvalidArgument)#232 (8) {
  ["prev":protected]=>
  NULL
  ["message":protected]=>
  string(49) "The provided URL does not match any known format."
  ["string":"Exception":private]=>
  string(0) ""
  ["code":protected]=>
  int(0)
  ["file":protected]=>
  string(76) "/var/www/mokuji-multisite/mokuji/components/cms/routing/UrlFormatFactory.php"
  ["line":protected]=>
  int(102)
  ["trace":"Exception":private]=>
  array(8) {
    [0]=>
    array(6) {
      ["file"]=>
      string(76) "/var/www/mokuji-multisite/mokuji/components/cms/routing/UrlFormatFactory.php"
      ["line"]=>
      int(23)
      ["function"]=>
      string(6) "detect"
      ["class"]=>
      string(39) "components\cms\routing\UrlFormatFactory"
      ["type"]=>
      string(2) "::"
      ["args"]=>
      array(2) {
        [0]=>
        string(28) "/viewtopic.php?f=16&t=38"
        [1]=>
        &bool(false)
      }
    }
    [1]=>
    array(6) {
      ["file"]=>
      string(62) "/var/www/mokuji-multisite/mokuji/components/cms/EntryPoint.php"
      ["line"]=>
      int(361)
      ["function"]=>
      string(6) "format"
      ["class"]=>
      string(39) "components\cms\routing\UrlFormatFactory"
      ["type"]=>
      string(2) "::"
      ["args"]=>
      array(3) {
        [0]=>
        string(28) "/viewtopic.php?f=16&t=38"
        [1]=>
        NULL
        [2]=>
        &bool(false)
      }
    }
    [2]=>
    array(6) {
      ["file"]=>
      string(62) "/var/www/mokuji-multisite/mokuji/components/cms/EntryPoint.php"
      ["line"]=>
      int(132)
      ["function"]=>
      string(11) "findPageUrl"
      ["class"]=>
      string(25) "components\cms\EntryPoint"
      ["type"]=>
      string(2) "->"
      ["args"]=>
      array(0) {
      }
    }
    [3]=>
    array(6) {
      ["file"]=>
      string(58) "/var/www/mokuji-multisite/mokuji/system/core/Component.php"
      ["line"]=>
      int(115)
      ["function"]=>
      string(8) "entrance"
      ["class"]=>
      string(25) "components\cms\EntryPoint"
      ["type"]=>
      string(2) "->"
      ["args"]=>
      array(0) {
      }
    }
    [4]=>
    array(6) {
      ["file"]=>
      string(55) "/var/www/mokuji-multisite/mokuji/system/core/Router.php"
      ["line"]=>
      int(212)
      ["function"]=>
      string(5) "enter"
      ["class"]=>
      string(14) "core\Component"
      ["type"]=>
      string(2) "->"
      ["args"]=>
      array(1) {
        [0]=>
        string(3) "cms"
      }
    }
    [5]=>
    array(6) {
      ["file"]=>
      string(74) "/var/www/mokuji-multisite/mokuji/system/dependencies/init/Environments.php"
      ["line"]=>
      int(201)
      ["function"]=>
      string(5) "start"
      ["class"]=>
      string(11) "core\Router"
      ["type"]=>
      string(2) "->"
      ["args"]=>
      array(0) {
      }
    }
    [6]=>
    array(6) {
      ["file"]=>
      string(73) "/var/www/mokuji-multisite/mokuji/system/dependencies/init/Initializer.php"
      ["line"]=>
      int(253)
      ["function"]=>
      string(6) "on_run"
      ["class"]=>
      string(30) "dependencies\init\Environments"
      ["type"]=>
      string(2) "::"
      ["args"]=>
      array(2) {
        [0]=>
        object(dependencies\init\Initializer)#1 (8) {
          ["is_installed":protected]=>
          bool(true)
          ["environment":protected]=>
          int(1)
          ["debugging":protected]=>
          bool(true)
          ["use_database":protected]=>
          bool(true)
          ["use_multisite":protected]=>
          bool(true)
          ["url_path":protected]=>
          string(0) ""
          ["root":protected]=>
          string(0) ""
          ["is_installing"]=>
          bool(false)
        }
        [1]=>
        int(1)
      }
    }
    [7]=>
    array(6) {
      ["file"]=>
      string(35) "/var/www/mokuji-multisite/index.php"
      ["line"]=>
      int(40)
      ["function"]=>
      string(15) "run_environment"
      ["class"]=>
      string(29) "dependencies\init\Initializer"
      ["type"]=>
      string(2) "->"
      ["args"]=>
      array(0) {
      }
    }
  }
  ["previous":"Exception":private]=>
  NULL
}