I managed to remove the errors but only remove the line where the error is, which is not the right thing to do.
C:\Users\neuza\Downloads\Server\pawno\include\_open_mp.inc(120) : error 075: input line too long (after substitutions)
// Optionally stricter tags.
#if defined NO_TAGS
#define __TAG(%0) _
#elseif defined STRONG_TAGS
#define __TAG(%0) T_%0
#if __pawn_build >= 11 //error on this line
#define OPEN_MP_TAGS {LANDING_GEAR_STATE, T_CONNECTION_STATUS, T_CP_TYPE, T_WEAPON, T_PLAYER_MARKERS_MODE, T_DIALOG_STYLE, T_HTTP_METHOD, T_HTTP_ERROR, T_DOWNLOAD_REQUEST, T_SELECT_OBJECT, T_OBJECT_MATERIAL_SIZE, T_OBJECT_MATERIAL_TEXT_ALIGN, T_EDIT_RESPONSE, T_PLAYER_STATE, T_SPECIAL_ACTION, T_FIGHT_STYLE, T_WEAPONSKILL, T_WEAPONSTATE, T_KEY, T_CAM_MODE, T_MAPICON, T_SPECTATE_MODE, T_PLAYER_RECORDING_TYPE, T_FORCE_SYNC, T_CLICK_SOURCE, T_BULLET_HIT_TYPE, T_TEXT_DRAW_FONT, T_TEXT_DRAW_ALIGN, T_VARTYPE, T_CARMODTYPE, T_VEHICLE_MODEL_INFO, T_VEHICLE_PANEL_STATUS, T_VEHICLE_DOOR_STATUS, T_VEHICLE_LIGHT_STATUS, T_VEHICLE_TYRE_STATUS, T_WEAPON_SLOT, Bit, Bitmap, XML, XMLEntry, Group, INI, Language, Style, DB, DBResult, Menu, Text, PlayerText, Text3D, PlayerText3D, File, Float, CUSTOM_TAG_TYPES, _}
#else
#define OPEN_MP_TAGS {T_WEAPON, Text, PlayerText, Text3D, PlayerText3D, File, Float, CUSTOM_TAG_TYPES, _}
#endif
C:\Users\neuza\Downloads\Server\pawno\include\_open_mp.inc(177) : error 017: undefined symbol "__ShowPlayerMarkers"
#emit SYSREQ.C __ShowPlayerMarkers //error on this line
#emit SYSREQ.C __ShowPlayerMarkers //error on this line
C:\Users\neuza\Downloads\Server\pawno\include\_open_mp.inc(194) : error 017: undefined symbol "__ShowPlayerMarkers"