ArgumentExcepti on in MethodInfo Invoke with non-native arguments

[Ffelagund]

Hello I'm trying to load dinamically some dll's but when I try to invoke
one method, I ever get ArgumentExcepti on if I'm not using native types.
Here are the .h of the dll:

#pragma once
#include <windows.h>
#include <gl/gl.h>
#include <gl/glu.h>

using namespace System;
namespace NShaderDesigner
{

public __gc struct ProceduralTextu reData
{
GLint internalFormat;
GLenum format;
GLubyte primaryPointer __gc[];
GLubyte _X __gc[];
GLubyte Y __gc[];
GLubyte _Y __gc[];
GLubyte Z __gc[];
GLubyte _Z __gc[];
};

__gc class Plugin
{
public:
bool PluginTexture(P roceduralTextur eData *data);
};
}
//--------------------------------------------------------
// Here are the .cpp of the dll
//--------------------------------------------------------
#include "ShaderDesigner SDK.h"

using namespace System;
using namespace NShaderDesigner ;

bool Plugin::PluginT exture(Procedur alTextureData *data)
{

return true;
}
//--------------------------------------------------------
// here are the call code
//--------------------------------------------------------

System::Void Textures::LoadP luginTexture(in t i)
{
Assembly *a = Assembly::LoadF ile(caps->textureFileNam e[i]);
Type *t = a->GetType("Plugi n");
MethodInfo *mi = t->GetMethod("Plu ginTexture");
Object *o = Activator::Crea teInstance(t);
ProceduralTextu reData *p[] = new ProceduralTextu reData*[1];
p[0] = new ProceduralTextu reData;
mi->Invoke(o,p);
}

//--------------------------------------------------------
// Here are the declaration of ProceduralTextu reData into the call code
//--------------------------------------------------------
namespace NShaderDesigner
{
public __gc struct ProceduralTextu reData
{
GLint internalFormat;
GLenum format;
GLubyte primaryPointer __gc[];
GLubyte _X __gc[];
GLubyte Y __gc[];
GLubyte _Y __gc[];
GLubyte Z __gc[];
GLubyte _Z __gc[];
};
}

Anyone could help me?
Thank you very much