I am getting this error
I have Unreal Engine version 4.26.2 and I have downloaded it from epic games launcher.
Log file open, 05/27/21 20:03:23
LogInit: LLM is enabled
LogInit: LLM CsvWriter: off TraceWriter: off
LogInit: Display: Running engine for game: BullCowGame
LogPlatformFile: Not using cached read wrapper
LogTaskGraph: Started task graph with 5 named threads and 14 total threads with 3 sets of task threads.
LogStats: Stats thread started at 3.113416
LogD3D11RHI: Loaded GFSDK_Aftermath_Lib.x64.dll
LogICUInternationalization: ICU TimeZone Detection - Raw Offset: +5:30, Platform Override: ''
LogPluginManager: Mounting plugin MeshPainting
LogPluginManager: Mounting plugin XGEController
LogPluginManager: Mounting plugin Paper2D
LogPluginManager: Mounting plugin AISupport
LogPluginManager: Mounting plugin EnvironmentQueryEditor
LogPluginManager: Mounting plugin LightPropagationVolume
LogPluginManager: Mounting plugin CameraShakePreviewer
LogPluginManager: Mounting plugin AnimationSharing
LogPluginManager: Mounting plugin CLionSourceCodeAccess
LogPluginManager: Mounting plugin CodeLiteSourceCodeAccess
LogPluginManager: Mounting plugin GitSourceControl
LogPluginManager: Mounting plugin KDevelopSourceCodeAccess
LogPluginManager: Mounting plugin NullSourceCodeAccess
LogPluginManager: Mounting plugin PerforceSourceControl
LogPluginManager: Mounting plugin PlasticSourceControl
LogPluginManager: Mounting plugin PropertyAccessNode
LogPluginManager: Mounting plugin PluginUtils
LogPluginManager: Mounting plugin RiderSourceCodeAccess
LogPluginManager: Mounting plugin SubversionSourceControl
LogPluginManager: Mounting plugin UObjectPlugin
LogPluginManager: Mounting plugin VisualStudioCodeSourceCodeAccess
LogPluginManager: Mounting plugin VisualStudioSourceCodeAccess
LogPluginManager: Mounting plugin XCodeSourceCodeAccess
LogPluginManager: Mounting plugin AssetManagerEditor
LogPluginManager: Mounting plugin CryptoKeys
LogPluginManager: Mounting plugin CurveEditorTools
LogPluginManager: Mounting plugin DataValidation
LogPluginManager: Mounting plugin FacialAnimation
LogPluginManager: Mounting plugin GameplayTagsEditor
LogPluginManager: Mounting plugin GeometryMode
LogPluginManager: Mounting plugin MacGraphicsSwitching
LogPluginManager: Mounting plugin MaterialAnalyzer
LogPluginManager: Mounting plugin MobileLauncherProfileWizard
LogPluginManager: Mounting plugin PluginBrowser
LogPluginManager: Mounting plugin SpeedTreeImporter
LogPluginManager: Mounting plugin Niagara
LogPluginManager: Mounting plugin AlembicImporter
LogPluginManager: Mounting plugin AutomationUtils
LogPluginManager: Mounting plugin BackChannel
LogPluginManager: Mounting plugin ChaosCloth
LogPluginManager: Mounting plugin ChaosClothEditor
LogPluginManager: Mounting plugin ChaosEditor
LogPluginManager: Mounting plugin ChaosNiagara
LogPluginManager: Mounting plugin ChaosSolverPlugin
LogPluginManager: Mounting plugin CharacterAI
LogPluginManager: Mounting plugin GeometryCache
LogPluginManager: Mounting plugin GeometryProcessing
LogPluginManager: Mounting plugin GeometryCollectionPlugin
LogPluginManager: Mounting plugin MotoSynth
LogPluginManager: Mounting plugin PlanarCut
LogPluginManager: Mounting plugin PlatformCrypto
LogPluginManager: Mounting plugin ProxyLODPlugin
LogPluginManager: Mounting plugin SkeletalReduction
LogPluginManager: Mounting plugin LuminPlatformFeatures
LogPluginManager: Mounting plugin MagicLeap
LogPluginManager: Mounting plugin MagicLeapLightEstimation
LogPluginManager: Mounting plugin MagicLeapMedia
LogPluginManager: Mounting plugin MagicLeapPassableWorld
LogPluginManager: Mounting plugin MLSDK
LogPluginManager: Mounting plugin AndroidMedia
LogPluginManager: Mounting plugin AvfMedia
LogPluginManager: Mounting plugin ImgMedia
LogPluginManager: Mounting plugin MediaCompositing
LogPluginManager: Mounting plugin MediaPlayerEditor
LogPluginManager: Mounting plugin WmfMedia
LogPluginManager: Mounting plugin WebMMedia
LogPluginManager: Mounting plugin TcpMessaging
LogPluginManager: Mounting plugin UdpMessaging
LogPluginManager: Mounting plugin ActorSequence
LogPluginManager: Mounting plugin LevelSequenceEditor
LogPluginManager: Mounting plugin MatineeToLevelSequence
LogPluginManager: Mounting plugin TemplateSequence
LogPluginManager: Mounting plugin OnlineSubsystem
LogPluginManager: Mounting plugin OnlineSubsystemNull
LogPluginManager: Mounting plugin OnlineSubsystemUtils
LogPluginManager: Mounting plugin LauncherChunkInstaller
LogPluginManager: Mounting plugin ActorLayerUtilities
LogPluginManager: Mounting plugin AndroidDeviceProfileSelector
LogPluginManager: Mounting plugin AndroidMoviePlayer
LogPluginManager: Mounting plugin AndroidPermission
LogPluginManager: Mounting plugin AppleImageUtils
LogPluginManager: Mounting plugin AppleMoviePlayer
LogPluginManager: Mounting plugin ArchVisCharacter
LogPluginManager: Mounting plugin AssetTags
LogPluginManager: Mounting plugin AudioCapture
LogPluginManager: Mounting plugin AudioSynesthesia
LogPluginManager: Mounting plugin CableComponent
LogPluginManager: Mounting plugin ChunkDownloader
LogPluginManager: Mounting plugin CustomMeshComponent
LogPluginManager: Mounting plugin EditableMesh
LogPluginManager: Mounting plugin ExampleDeviceProfileSelector
LogPluginManager: Mounting plugin GoogleCloudMessaging
LogPluginManager: Mounting plugin GooglePAD
LogPluginManager: Mounting plugin IOSDeviceProfileSelector
LogPluginManager: Mounting plugin LinuxDeviceProfileSelector
LogPluginManager: Mounting plugin LocationServicesBPLibrary
LogPluginManager: Mounting plugin MobilePatchingUtils
LogPluginManager: Mounting plugin PostSplashScreen
LogPluginManager: Mounting plugin PhysXVehicles
LogPluginManager: Mounting plugin ProceduralMeshComponent
LogPluginManager: Mounting plugin PropertyAccessEditor
LogPluginManager: Mounting plugin RuntimePhysXCooking
LogPluginManager: Mounting plugin SignificanceManager
LogPluginManager: Mounting plugin SoundFields
LogPluginManager: Mounting plugin Synthesis
LogPluginManager: Mounting plugin WebMMoviePlayer
LogPluginManager: Mounting plugin WindowsMoviePlayer
LogPluginManager: Mounting plugin ScreenshotTools
LogPluginManager: Mounting plugin DatasmithContent
LogPluginManager: Mounting plugin VariantManagerContent
LogPluginManager: Mounting plugin ContentBrowserAssetDataSource
LogPluginManager: Mounting plugin ContentBrowserClassDataSource
LogPluginManager: Mounting plugin OnlineSubsystemGooglePlay
LogPluginManager: Mounting plugin OnlineSubsystemIOS
LogPluginManager: Mounting plugin OculusVR
LogPluginManager: Mounting plugin SteamVR
LogXGEController: Cleaning working directory: C:/Users/prastuti/AppData/Local/Temp/UnrealXGEWorkingDir/
LogXGEController: Cannot use XGE Controller as Incredibuild is not installed on this machine.
Launching UnrealBuildTool... [C:/Program Files (x86)/Epic Games/UE_4.26/Engine/Binaries/DotNET/UnrealBuildTool.exe -Mode=QueryTargets -Project="C:/Users/prastuti/Documents/Unreal Projects/BullCowGame-starter-kit/BullCowGame.uproject" -Output="C:/Users/prastuti/Documents/Unreal Projects/BullCowGame-starter-kit/Intermediate/TargetInfo.json"]
Launching UnrealBuildTool... [C:/Program Files (x86)/Epic Games/UE_4.26/Engine/Binaries/DotNET/UnrealBuildTool.exe -Mode=QueryTargets -Project="C:/Users/prastuti/Documents/Unreal Projects/BullCowGame-starter-kit/BullCowGame.uproject" -Output="C:/Users/prastuti/Documents/Unreal Projects/BullCowGame-starter-kit/Intermediate/TargetInfo.json"]
LogDesktopPlatform: Warning: Unable to read target info for ../../../../../../Users/prastuti/Documents/Unreal Projects/BullCowGame-starter-kit/BullCowGame.uproject
LogInit: Warning: Incompatible or missing module: BullCowGame
Running C:/Program Files (x86)/Epic Games/UE_4.26/Engine/Binaries/DotNET/UnrealBuildTool.exe Development Win64 -Project="C:/Users/prastuti/Documents/Unreal Projects/BullCowGame-starter-kit/BullCowGame.uproject" -TargetType=Editor -Progress -NoEngineChanges -NoHotReloadFromIDE
ERROR: A conflicting instance of UnrealBuildTool is already running.
LogInit: Warning: Still incompatible or missing module: BullCowGame
LogCore: Engine exit requested (reason: EngineExit() was called)
LogExit: Preparing to exit.
LogModuleManager: Shutting down and abandoning module DesktopPlatform (48)
LogModuleManager: Shutting down and abandoning module PlatformCryptoOpenSSL (46)
LogModuleManager: Shutting down and abandoning module PlatformCryptoTypes (44)
LogModuleManager: Shutting down and abandoning module PlatformCrypto (42)
LogModuleManager: Shutting down and abandoning module XGEController (40)
LogXGEController: Cleaning working directory: C:/Users/prastuti/AppData/Local/Temp/UnrealXGEWorkingDir/
LogModuleManager: Shutting down and abandoning module AnimationModifiers (38)
LogModuleManager: Shutting down and abandoning module AudioEditor (36)
LogModuleManager: Shutting down and abandoning module PropertyEditor (35)
LogModuleManager: Shutting down and abandoning module TextureCompressor (32)
LogModuleManager: Shutting down and abandoning module RenderCore (30)
LogModuleManager: Shutting down and abandoning module Landscape (28)
LogModuleManager: Shutting down and abandoning module SlateRHIRenderer (26)
LogModuleManager: Shutting down and abandoning module OpenGLDrv (24)
LogModuleManager: Shutting down and abandoning module D3D11RHI (22)
LogModuleManager: Shutting down and abandoning module AnimGraphRuntime (20)
LogModuleManager: Shutting down and abandoning module Renderer (18)
LogModuleManager: Shutting down and abandoning module Engine (16)
LogModuleManager: Shutting down and abandoning module CoreUObject (14)
LogModuleManager: Shutting down and abandoning module NetworkFile (12)
LogModuleManager: Shutting down and abandoning module CookedIterativeFile (10)
LogModuleManager: Shutting down and abandoning module StreamingFile (8)
LogModuleManager: Shutting down and abandoning module SandboxFile (6)
LogModuleManager: Shutting down and abandoning module PakFile (4)
LogModuleManager: Shutting down and abandoning module RSA (3)
LogExit: Exiting.
Log file closed, 05/27/21 20:03:52