Can't compile on ue and have : was modified or is new

Hello, i tried your code but when i put :

UPROPERTY(EditAnywhere, BlueprintReadWrite)
TObjectPtr PhysMat;

i get :

Building patch from 4 file(s) for Live coding module C:\Users\slnob\OneDrive\Documents\Unreal Projects\MultiplyOrRelease\Binaries\Win64\UnrealEditor-MultiplyOrRelease.dll
Création de la bibliothèque C:\Users\slnob\OneDrive\Documents\Unreal Projects\MultiplyOrRelease\Binaries\Win64\UnrealEditor-MultiplyOrRelease.patch_2.lib et de l’objet C:\Users\slnob\OneDrive\Documents\Unreal Projects\MultiplyOrRelease\Binaries\Win64\UnrealEditor-MultiplyOrRelease.patch_2.exp
BCRouge.gen.cpp.obj : error LNK2019: symbole externe non résolu “__declspec(dllimport) class UClass * __cdecl Z_Construct_UClass_UPhysicalMaterial_NoRegister(void)” (_imp?Z_Construct_UClass_UPhysicalMaterial_NoRegister@@YAPEAVUClass@@XZ) référencé dans la fonction “void __cdecl `dynamic initializer for ‘public: static struct UECodeGen_Private::FObjectPropertyParams const Z_Construct_UClass_ABCRouge_Statics::NewProp_PhysMat’'(void)” (??__E?NewProp_PhysMat@Z_Construct_UClass_ABCRouge_Statics@@2UFObjectPropertyParams@UECodeGen_Private@@B@@YAXXZ)
C:\Users\slnob\OneDrive\Documents\Unreal Projects\MultiplyOrRelease\Binaries\Win64\UnrealEditor-MultiplyOrRelease.patch_2.exe : fatal error LNK1120: 1 externes non résolus
Failed to link patch (0.000s) (Exit code: 0x460)

i don’t know why