Error when attempting to package project.

Hi I revived this error when attempting to package the project.

May I get some help in resolving this problem?

Combat_Component.cpp.obj : error LNK2019: unresolved external symbol “public: void cdecl AWeapon::Set_Weapon_State(enum EWeaponState)” (?Set_Weapon_State@AWeapon@@QEAAXW4EWeaponState@@@Z) referenced in function “public: void cdecl UCombat_Component::Equip_Weapon(class AWeapon *)” (?Equip_Weapon@UCombat_Component@@QEAAXPEAVAWeapon@@@Z)

E:\Unreal Engine\My Game Projects\Third_Person_Shooter_MultiPlayer\Shooter_Online\Binaries\Win64\Shooter_Online.exe : fatal error LNK1120: 1 unresolved externals

Here is my full Log

UBT-Shooter_Online-Win64-Development.txt (358.1 KB)