This error is thrown while the black ARMA start screen is displayed (before start menu):

7:08:39 Error in expression <Name _x + "_intialised",true];
_display displayAddEventHandler [configName _x se>
7:08:39 Error position: <displayAddEventHandler [configName _x se>
7:08:39 Error Foreign error: Unknown enum value: "EMMMenuShow"
7:08:39 File vn\emm\main_menu\fnc\initMenu.sqf..., line 46
7:08:39 Error in expression <Name _x + "_intialised",true];
_display displayAddEventHandler [configName _x se>
7:08:39 Error position: <displayAddEventHandler [configName _x se>
7:08:39 Error Foreign error: Unknown enum value: "EMMMenuHide"
7:08:39 File vn\emm\main_menu\fnc\initMenu.sqf..., line 46