What does “Invalid managed/unmanaged type combination.” mean?

Question

I have the following struct:

    [StructLayout(LayoutKind.Auto,Pack=0)]
    private unsafe struct BIRDSYSTEMCONFIG
    {
        public byte bySystemStatus;
         


        

Answer 1

Turns out all I needed to do was change:

[StructLayout(LayoutKind.Auto,Pack=0)]

To

[StructLayout(LayoutKind.Sequential,Pack=0)]

Since the question was about more than just how to solve it, I'll leave it open for a while. It'd be nice to find out a bit more about this error.