Plugin Disabled Call to undefined method

A plugin, called EggWars I downloaded gets disabled when i do a /reload, and this come up in console: Call to undefined method pocketmine\Server::getScheduler()
Just to let anyone helping me know I do not know too much about plugins, so instructions on what to do where would be appreciated. Some images below I think might help:

 

remove $this->getServer() in line 53 in EggWars.php

 

There is no $this>getServer() on line 53
This is line 53
The closest is on line 306

 

Also isnt their supposed to be ?> at the end of PHP? It may not be the issue im just tryna help. On the end of the php there is no ?>

 

Remove server::getInstance() and change to the main class's instance and then ->getScheduler()