Understanding the __CxxCallUnwindDtor error

Cartoper

I am working on a managed C++ assembly (.Net 1.1) that is a go between
C# and a camera SDK. I am trying to create a set of classes to handle
the images that come back from the camera, some times they will be RAW
and others JPEG. I am getting the following error when I have a
constructor in the base camera image class:

unresolved external symbol "void __cdecl __CxxCallUnwindDtor(void
(__thiscall*)(void *),void *)"

What I have found is this: When I comment out the ~CameraImageBase(),
the error goes away. When I put this code into a clean C++ CLI
console application, it compiled just fine with the destructor. What
could I be doing else where that is causing things not to work in the
main code?

Here is my code:

public __gc class CameraImageBase : public IDisposable
{
public:
CameraImageBase(int dataSize)
{
this->m_imageMemory = Marshal::AllocHGlobal(dataSize);
}

~CameraImageBase() { Cleanup(); }

void Dispose() { Cleanup(); }

__property unsigned char __nogc* get_RawData()
{
return static_cast<unsigned char*>(m_imageMemory.ToPointer());
}

protected:
IntPtr m_imageMemory;

private:
void Cleanup()
{
if(this->m_imageMemory != NULL)
{
Marshal::FreeHGlobal(this->m_imageMemory);
}
}
};

public __gc class CameraJpegImage : public CameraImageBase
{
public:
CameraJpegImage(int dataSize) : CameraImageBase(dataSize) {}

__property Image* get_Image()
{
return NULL;
}
};