Thanks for @DanM help. This problem is solved finally.
This is a bug of UE 4.25 of Mac user only
Follow below steps to solve this issue by:
Go to your VS code. On your left choose
BullCowGame → .vscode → c_cpp_properties.json
Open file c_cpp_properties.json
near the bottom of this file you should see a line of code:
defines[ ]
which is an empty array.
Copy below codes to this array, then your problem will be solved.
"IS_PROGRAM=0",
"UE_EDITOR=1",
"HAS_METAL=1",
"ENABLE_PGO_PROFILE=0",
"USE_VORBIS_FOR_STREAMING=1",
"WITH_DEV_AUTOMATION_TESTS=1",
"WITH_PERF_AUTOMATION_TESTS=1",
"UNICODE",
"_UNICODE",
"__UNREAL__",
"IS_MONOLITHIC=0",
"WITH_ENGINE=1",
"WITH_UNREAL_DEVELOPER_TOOLS=1",
"WITH_APPLICATION_CORE=1",
"WITH_COREUOBJECT=1",
"USE_STATS_WITHOUT_ENGINE=0",
"WITH_PLUGIN_SUPPORT=0",
"WITH_PERFCOUNTERS=1",
"USE_LOGGING_IN_SHIPPING=0",
"WITH_LOGGING_TO_MEMORY=0",
"USE_CACHE_FREED_OS_ALLOCS=1",
"USE_CHECKS_IN_SHIPPING=0",
"WITH_EDITOR=1",
"WITH_SERVER_CODE=1",
"WITH_CEF3=1",
"WITH_LIVE_CODING=0",
"WITH_XGE_CONTROLLER=0",
"UBT_MODULE_MANIFEST=\"UE4Editor.modules\"",
"UBT_MODULE_MANIFEST_DEBUGGAME=\"UE4Editor-Mac-DebugGame.modules\"",
"UBT_COMPILED_PLATFORM=Mac",
"UBT_COMPILED_TARGET=Editor",
"UE_APP_NAME=\"UE4Editor\"",
"PLATFORM_MAC=1",
"PLATFORM_APPLE=1",
"WITH_TTS=0",
"WITH_SPEECH_RECOGNITION=0",
"NDEBUG=1",
"UE_BUILD_DEVELOPMENT=1",
"UE_IS_ENGINE_MODULE=0",
"UE_PROJECT_NAME=BullCowGame",
"IMPLEMENT_ENCRYPTION_KEY_REGISTRATION()=",
"IMPLEMENT_SIGNING_KEY_REGISTRATION()=",
"DEPRECATED_FORGAME=DEPRECATED",
"UE_DEPRECATED_FORGAME=UE_DEPRECATED",
"INCLUDE_CHAOS=0",
"WITH_PHYSX=1",
"WITH_CHAOS=0",
"PHYSICS_INTERFACE_LLIMMEDIATE=0",
"PHYSICS_INTERFACE_PHYSX=1",
"WITH_APEX=1",
"WITH_APEX_CLOTHING=1",
"WITH_CLOTH_COLLISION_DETECTION=1",
"WITH_PHYSX_COOKING=1",
"WITH_NVCLOTH=1",
"WITH_CUSTOM_SQ_STRUCTURE=0",
"WITH_IMMEDIATE_PHYSX=0",
"GPUPARTICLE_LOCAL_VF_ONLY=0",
"ENGINE_API=",
"UE_ENABLE_ICU=1",
"WITH_DIRECTXMATH=0",
"WITH_MALLOC_STOMP=1",
"CORE_API=",
"COREUOBJECT_API=",
"APPLICATIONCORE_API=",
"RHI_API=",
"JSON_API=",
"WITH_FREETYPE=1",
"SLATECORE_API=",
"INPUTCORE_API=",
"SLATE_API=",
"WITH_UNREALPNG=1",
"WITH_UNREALJPEG=1",
"WITH_UNREALEXR=1",
"IMAGEWRAPPER_API=",
"MESSAGING_API=",
"MESSAGINGCOMMON_API=",
"RENDERCORE_API=",
"SOCKETS_PACKAGE=1",
"SOCKETS_API=",
"UTILITYSHADERS_API=",
"ASSETREGISTRY_API=",
"ENGINEMESSAGES_API=",
"ENGINESETTINGS_API=",
"SYNTHBENCHMARK_API=",
"RENDERER_API=",
"GAMEPLAYTAGS_API=",
"PACKETHANDLER_API=",
"RELIABILITYHANDLERCOMPONENT_API=",
"AUDIOPLATFORMCONFIGURATION_API=",
"MESHDESCRIPTION_API=",
"PAKFILE_API=",
"RSA_API=",
"WITH_RECAST=1",
"UNREALED_API=",
"BSPMODE_API=",
"DIRECTORYWATCHER_API=",
"DOCUMENTATION_API=",
"LOAD_PLUGINS_FOR_TARGET_PLATFORMS=1",
"PROJECTS_API=",
"SANDBOXFILE_API=",
"EDITORSTYLE_API=",
"SOURCE_CONTROL_WITH_SLATE=1",
"SOURCECONTROL_API=",
"UNREALEDMESSAGES_API=",
"GAMEPLAYDEBUGGER_API=",
"BLUEPRINTGRAPH_API=",
"EDITORSUBSYSTEM_API=",
"HTTP_PACKAGE=1",
"WITH_LIBCURL=0",
"HTTP_API=",
"UNREALAUDIO_API=",
"FUNCTIONALTESTING_API=",
"AUTOMATIONCONTROLLER_API=",
"LOCALIZATION_API=",
"WITH_SNDFILE_IO=0",
"AUDIOEDITOR_API=",
"LEVELEDITOR_API=",
"SETTINGS_API=",
"INTROTUTORIALS_API=",
"HEADMOUNTEDDISPLAY_API=",
"VREDITOR_API=",
"COMMONMENUEXTENSIONS_API=",
"LANDSCAPE_API=",
"PROPERTYEDITOR_API=",
"ACTORPICKERMODE_API=",
"SCENEDEPTHPICKERMODE_API=",
"DETAILCUSTOMIZATIONS_API=",
"CLASSVIEWER_API=",
"GRAPHEDITOR_API=",
"CONTENTBROWSER_API=",
"ENABLE_HTTP_FOR_NFS=1",
"NETWORKFILESYSTEM_API=",
"UMG_API=",
"MOVIESCENE_API=",
"TIMEMANAGEMENT_API=",
"MOVIESCENETRACKS_API=",
"ANIMATIONCORE_API=",
"PROPERTYPATH_API=",
"NAVIGATIONSYSTEM_API=",
"MESHDESCRIPTIONOPERATIONS_API=",
"MESHBUILDER_API=",
"MATERIALSHADERQUALITYSETTINGS_API=",
"COLLECTIONMANAGER_API=",
"ADDCONTENTDIALOG_API=",
"USE_EMBREE=1",
"MESHUTILITIES_API=",
"MESHMERGEUTILITIES_API=",
"HIERARCHICALLODUTILITIES_API=",
"MESHREDUCTIONINTERFACE_API=",
"ASSETTOOLS_API=",
"KISMETCOMPILER_API=",
"GAMEPLAYTASKS_API=",
"WITH_GAMEPLAY_DEBUGGER=1",
"AIMODULE_API=",
"KISMET_API=",
"CLOTHINGSYSTEMRUNTIMEINTERFACE_API=",
"NETWORKREPLAYSTREAMING_API=",
"AUDIOMIXER_API=",
"BULLCOWGAME_API="