access violation With dll?

[Taylor Hillegeist via Digitalmars-d-learn]

Beleive it or not the code below does work. However I get an 
access violation after every run? any Ideas why?

+++++++++++++++++++++++++Code to Run DLL 
function+++++++++++++++++++++++++++

import core.runtime;
import std.stdio;
import core.memory;
import std.c.windows.windows;

int main()
{
    HMODULE h;
    FARPROC fp;

    printf("Start Dynamic Link...\n");
    h = cast(HMODULE) Runtime.loadLibrary("SharedLib.dll");

    void function(ref char[], int) Testf
          = cast(void function(ref char[], int))
          GetProcAddress(h, "Test"); //Function Says HELLO WORLD

    char[] STUFF;
    STUFF.length = 5000;
    Testf( STUFF , STUFF.length);

    printf("%s\n", (&STUFF)); //PRINTS HELLO WORLD

    Runtime.unloadLibrary(h);

    printf("End...\n");
    return 0;
}
++++++++++++++++++++++++++++++END CODE+++++++++++++++++++++++++++
the function header has this line:

void __cdecl Test(char MyOutput[], int32_t len);

and i get this Error:
object.Error@(0): Access Violation
----------------
0x77206568
0x646C726F
0x00405A2C in int object.ModuleInfo.opApply(scope int 
delegate(object.ModuleInfo*))
0x0040222C in main
0x00414949 in mainCRTStartup
0x7678337A in BaseThreadInitThunk
0x770592E2 in RtlInitializeExceptionChain
0x770592B5 in RtlInitializeExceptionChain

To be honest I was surprised this worked, since i am fairly 
unfamiliar to linking to dlls.