Issue: Error when trying to subscribe

ErrorException: Fatal Error: Call to undefined method vw_UI_Watch_Controller::get_subscription() - vault/core/controller/ui/watch/vw.php:973
Generated By: dustman, Today at 9:14 AM
Stack Trace
#0 [internal function]: XenForo_Application::handleFatalError()
#1 {main}
Request State
array(3) {
  ["url"] => string(56) "http://letscreate.me/index.php?wiki_index-watch/&do=save"
  ["_GET"] => array(2) {
    ["wiki_index-watch/"] => string(0) ""
    ["do"] => string(4) "save"
  }
  ["_POST"] => array(9) {
    ["notifytype"] => string(1) "1"
    ["sub_options"] => array(2) {
      ["item_edits"] => string(1) "1"
      ["item_comments"] => string(1) "1"
    }
    ["submit"] => string(19) "Update Subscription"
    ["_xfToken"] => string(8) "********"
    ["do"] => string(4) "save"
    ["nodeid"] => string(1) "4"
    ["nodetypeid"] => string(1) "1"
    ["returnid"] => string(1) "4"
    ["returntype"] => string(1) "1"
  }
}