Overloaded function differs only by return type

Development Pipeline & Plugins Plugins
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1

I just started working a new plugin for my project, and am just trying to build it initially right now so I can enable it in the editor and such.

I have the following classes

MyPlugin.h

#pragma once

#include "CoreMinimal.h"
#include "ModuleManager.h"

class FMyPluginModule : public IModuleInterface
{
public:

	virtual void StartupModule() override;
	virtual void ShutdownModule() override;
	void PreUnloadCallback() override;
}

MyPlugin.cpp

#include "MyPlugin.h"

void FMyPluginModule::StartupModule()
{

}

void FMyPluginModule::ShutdownModule()
{

}

void FMyPluginModule::PreUnloadCallback()
{
	IModuleInterface::PreUnloadCallback();
}

For some reason I get the following errors when trying to build:

Error C2371 ‘FMyPluginModule::StartupModule’: redefinition; different basic types

Error C2556 ‘FMyPluginModule FMyPluginModule::StartupModule(void)’: overloaded function differs only by return type from ‘voidFMyPluginModule::StartupModule(void)’

Error C2628 ‘FMyPluginModule’ followed by ‘void’ is illegal (did you forget a ‘;’?)

I don’t see where my function definition is changing at unless I’m missing something here.