Shader compile error

Development Programming & Scripting C++
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1

I have made a simple shader called MyTest.usf, and write a c++ VS and PS class for it . Unfortunately, I got ‘Internal Error!’ after shader compiling. There is no more debug info to figure out why.

This is the c++ code and shader code

MyTest.usf

#include "/Engine/Public/Platform.ush"

void MainVS(
    in float4 InPosition : ATTRIBUTE0,
    out float4 Output : SV_POSITION
)
{
    Output = InPosition;
}

// Simple solid color pixel shader
float4 MainPS() : SV_Target0
{
    return float4(0,0,0,0);
}

MyTest.cpp

class FMyTestVS : public FGlobalShader
{
	DECLARE_GLOBAL_SHADER(FMyTestVS);

	SHADER_USE_PARAMETER_STRUCT(FMyTestVS, FGlobalShader);

	BEGIN_SHADER_PARAMETER_STRUCT(FParameters, )

	END_SHADER_PARAMETER_STRUCT()
	
	static bool ShouldCache(EShaderPlatform Platform)
	{
		return true;
	}
};
IMPLEMENT_GLOBAL_SHADER(FMyTestVS, "/Engine/Private/MyTest.usf", "MainVS", SF_Vertex);

class FMyTestPS : public FGlobalShader
{
	DECLARE_GLOBAL_SHADER(FMyTestPS);

	SHADER_USE_PARAMETER_STRUCT(FMyTestPS, FGlobalShader);

	BEGIN_SHADER_PARAMETER_STRUCT(FParameters, )
		RENDER_TARGET_BINDING_SLOTS()
	END_SHADER_PARAMETER_STRUCT()


	static void ModifyCompilationEnvironment(const FGlobalShaderPermutationParameters& Parameters, FShaderCompilerEnvironment& OutEnvironment)
	{
		FGlobalShader::ModifyCompilationEnvironment(Parameters, OutEnvironment);
		// Add your own defines for the shader code
		//OutEnvironment.SetDefine(TEXT("MY_DEFINE"), 1);
	}

	static bool ShouldCache(EShaderPlatform Platform)
	{
		// Could skip compiling for Platform == SP_METAL for example
		return true;
	}


};
IMPLEMENT_GLOBAL_SHADER(FMyTestPS, "/Engine/Private/MyTest.usf", "MainPS", SF_Pixel);

Please help me if you have any idea. I’m freshman of UE, by the way.