GameFramework | game framework , based on Unity game engine | Game Engine library

It’s your mistake. You’re never initializing SpringArm, and even if it were set in your actor instance (or through a blueprint or subclass), it wouldn’t be available during the constructor (and would still crash when constructing the CDO).

In the original code, you have global variables rank/suit, class members rank/suit, and parameters rank/suit all within scope in InitCard(). So which ones do you expect the compiler to use on the right-hand of the statements this->rank = rank; this->suit = suit;? It is not going to be the class members, it will be the function parameters since they are in local scope. And the compiler warns you about that, since they have the same names as the class members.

Removing the global variables, and renaming the parameters, avoids any ambiguity. So would initializing the class in its constructor using its member initialization list, not a separate Init method:

The function is in different module and you didn't add dependency of that module in build script (*.build.cs file)

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The definition of UNavigationPath needs to be available at the point where you do NavPath->PathPoints. Without the definition, how does the compiler know that UNavigationPath even has a member called PathPoints? You can have a pointer to a declared but undefined class (i.e., one you defined like class UNavigationPath; with no body) and pass it around but you can't access any of its members. Find the header file that defines UNavigationPath and make sure it's included in your source.

your Weapon is protected value. Protected members are accessible in the class that defines them and in classes that inherit from that class. I don't know where Weapon = Player->Weapon->WeaponMesh; //error occurs here under WeaponMesh is called, but it seems to make an error.

try to make your Weapon value as public or make getter function.

That would be AActor::ReceiveHit, since PlayerBall inherits from APawn which inherits from AActor.

The error is fairly self-explanatory.

cannot convert argument 2 from 'void (_cdecl AAICharacter::*)(AActor*,UPrimitiveComponent*,int32,bool,const FHitResult &)' to 'void (_cdecl AAICharacter::*)(UPrimitiveComponent*, AActor*,UPrimitiveComponent*,int32,bool,const FHitResult &)

The second argument in the indicated lines (so &AAICharacter::OnBoxOverlap and &AAICharacter::OnBoxEndOverlap) have the first type listed in the message, while the function being called (AddDynamic()) expects the second type. Sometimes differing types is not a problem, but in this case there is no way to convert from one to the other.

The only trick I see comes after comparing the types in question. It helps to insert spaces so that things line up better.

This fixed it, I did not create a mesh: https://www.youtube.com/watch?v=30XEdBoPw6c

I added the following:

.cpp

You're attempting to dereference WeaponClass when you try to access its default object but it hasn't yet been assigned to anything.

You can initialize it in the constructor initializer list, like so: