When i try and reload Event manager it says its misspelt or doesnt exist

Failed compiling 'EMInterface.cs':
Failed compiling 'EMInterface.cs':
1. The type or namespace name 'EventManager' could not be found (are you missing a using directive or an assembly reference?) [CS0246]
(EMInterface 64 line 808)
1. The type or namespace name 'EventManager' could not be found (are you missing a using directive or an assembly reference?) [CS0246]
(EMInterface 64 line 808)
2. The name 'EventManager' does not exist in the current context [CS0103]
(EMInterface 93 line 73)
2. The name 'EventManager' does not exist in the current context [CS0103]
(EMInterface 93 line 73)
3. 'ArgEx.Player(ConsoleSystem.Arg)' is a method, which is not valid in the given context [CS0119]
(EMInterface 202 line 901)
3. 'ArgEx.Player(ConsoleSystem.Arg)' is a method, which is not valid in the given context [CS0119]
(EMInterface 202 line 901)
Warning! 'EventManager' uses UnityEngine.GameObject.FindObjectsOfType. That may cause significant performance drops, and/or server stalls. Report to the developer or use at your own discretion!
Warning! 'EventManager' uses UnityEngine.GameObject.FindObjectsOfType. That may cause significant performance drops, and/or server stalls. Report to the developer or use at your own discretion!
Couldn't find required plugin 'EMInterface' for 'EventManager'
Couldn't find required plugin 'EMInterface' for 'EventManager'