UE5 proejct Keeps Crashing when Start up

Crash Log is this :

LoginId:
EpicAccountId

Assertion failed: Pair != nullptr [File:C:\Program Files\Epic Games\UE_5.0\Engine\Source\Runtime\Core\Public\Containers\Map.h] [Line: 656]

UnrealEditor_ProjectFVS!AProjectFVSCharacter::AProjectFVSCharacter() [C:\Users\kcjse\Desktop\Unreal Portfolio\ProjectFVS\Source\ProjectFVS\ProjectFVSCharacter.cpp:43]
UnrealEditor_CoreUObject!UClass::CreateDefaultObject() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\Class.cpp:3897]
UnrealEditor_CoreUObject!UObjectLoadAllCompiledInDefaultProperties() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectBase.cpp:836]
UnrealEditor_CoreUObject!ProcessNewlyLoadedUObjects() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectBase.cpp:920]
UnrealEditor_CoreUObject!TBaseStaticDelegateInstance<void __cdecl(FName,bool),FDefaultDelegateUserPolicy>::ExecuteIfSafe() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:731]
UnrealEditor_Core!TMulticastDelegate<void __cdecl(FName,bool),FDefaultDelegateUserPolicy>::Broadcast() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateSignatureImpl.inl:967]
UnrealEditor_Core!FModuleManager::LoadModuleWithFailureReason() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Private\Modules\ModuleManager.cpp:558]
UnrealEditor_Projects!FModuleDescriptor::LoadModulesForPhase() [D:\build++UE5\Sync\Engine\Source\Runtime\Projects\Private\ModuleDescriptor.cpp:690]
UnrealEditor_Projects!FProjectManager::LoadModulesForProject() [D:\build++UE5\Sync\Engine\Source\Runtime\Projects\Private\ProjectManager.cpp:62]
UnrealEditor!FEngineLoop::LoadStartupModules() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:4118]
UnrealEditor!FEngineLoop::PreInitPostStartupScreen() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:3469]
UnrealEditor!GuardedMain() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:137]
UnrealEditor!GuardedMainWrapper() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:147]
UnrealEditor!LaunchWindowsStartup() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:283]
UnrealEditor!WinMain() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:330]
UnrealEditor!__scrt_common_main_seh() [d:\a01_work\6\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
kernel32
ntdll

it keeps crashing when I just open my project.

it seems like project file is corrupted, but I don’t know how to fix this…

This crash started when I compiled the AProjectFVSCharacter class.