I have this issue which I'm not sure how to fix when installing ESS:
ErrorMessage: File mpmissions\DayZ_Epoch_11.Chernarus\spawn\class.hpp, line 53: /E_Class_Dialog/Controls.E_Class_ButtonSelect: Undefined base class 'E_RscButton'
class E_RscListBox { access = 0; type = 5; w = 0.4; h = 0.4; rowHeight = 0; colorText[] = {0.75,0.75,0.75,0.8}; colorScrollbar[] = {0.75,0.75,0.75,0.5}; colorSelect[] = {1,1,1,1}; colorSelect2[] = {1,1,1,1}; colorSelectBackground[] = {0,0,0,1}; colorSelectBackground2[] = {0.75,0.75,0.75,.8}; colorBackground[] = {0,0,0,0}; soundSelect[] = {"",0.1,1}; arrowEmpty = "#(argb,8,8,3)color(1,1,1,1)"; arrowFull = "#(argb,8,8,3)color(1,1,1,1)"; class ScrollBar { color[] = {0.75,0.75,0.75,0.5}; colorActive[] = {0.75,0.75,0.75,0.5}; colorDisabled[] = {0.75,0.75,0.75,.5}; shadow = 0; thumb = "\ca\ui\data\ui_scrollbar_thumb_ca.paa"; arrowFull = "\ca\ui\data\ui_arrow_top_active_ca.paa"; arrowEmpty = "\ca\ui\data\ui_arrow_top_ca.paa"; border = "\ca\ui\data\ui_border_scroll_ca.paa"; }; style = 0x02; font = "Bitstream"; shadow = 2; sizeEx = 0.037; color[] = {0.75,0.75,0.75,0.5}; period = 1.2; maxHistoryDelay = 1; autoScrollSpeed = -1; autoScrollDelay = 5; autoScrollRewind = 0; }; class E_Class_Dialog { idd = -1; movingenable = true; class Controls { class E_Class_ListBox: E_RscListBox { idc = 8888; x = 0.424439 * safezoneW + safezoneX; y = 0.292117 * safezoneH + safezoneY; w = 0.151945 * safezoneW; h = 0.32007 * safezoneH; }; class E_Class_ButtonSelect: E_RscButton { idc = -1; text = "Select class"; colorText[] = {1,1,1,.9}; colorDisabled[] = {0.4,0.4,0.4,0}; colorBackground[] = {0.75,0.75,0.75,0.8}; colorBackgroundDisabled[] = {0,0,0}; colorBackgroundActive[] = {0.75,0.75,0.75,1}; colorFocused[] = {0.75,0.75,0.75,.5}; x = 0.46 * safezoneW + safezoneX; y = 0.638 * safezoneH + safezoneY; w = 0.08 * safezoneW; h = 0.03 * safezoneH; action = "call classPick;"; }; }; };