Unresolved external symbol

Development Programming & Scripting UI
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3

Ok, I have definitions for the functions in both the interface and my character class.
CharacterInterface.cpp:

bool ICharacterInterface::IsHoldingLedge()
{
	return true;
}

CharacterInterface.h (According to Epic’s documentation on interfaces, it is common practice to write functions in here, “…when a function does nothing by default, or has a trivial behavior like returning false, zero, an empty string (or something similar).”:

virtual bool NotHoldingLedge()
{
	return false;
};

SideScrollerExample2Character.cpp

bool ASideScrollerExample2Character::IsHoldingLedge()
 { 
           return true;
 }

//...

bool ASideScrollerExample2Character::NotHoldingLedge()
{
           return false;
}

Not only do I have the same errors as before, but I also have things like ““public: virtual bool __cdecl ASideScrollerExample2Character::IsHoldingLedge(void)” (?IsHoldingLedge@ASideScrollerExample2Character@@UEAA_NXZ) already defined in SideScrollerExample2Character.cpp.obj” (there’s one for NotHoldingLedge as well).