Unhandled exception

I have got an error when running a C++ (Visual Studio 6) program which calls

a method (bolCheckInput()) from a VB 6 dll. The error is: "Unhandled

exception in TestPassword.exe (RICHED20.DLL): 0XC0000005: Access Violation".

The code portion in VC++ is as follows:

_stsclsFInputPasswordPtr pPassword;

hr = pPassword.CreateInstance(__uuidof(stsclsFInputPassword));

switch (hr) {

case S_OK:

{

VARIANT_BOOL password;

password = pPassword->bolCheckInput("Communication Server");

pPassword.Release();

CoUninitialize();

return(password == VARIANT_TRUE ? TRUE : FALSE);

break;

}

When the vb dll is runing in debug mode, no error occurs, But if the dll is

not running in debug mode, the C++ program would have this error when it is

terminates. Any idea about this error? Thanks.

I am running on Xp Pro SP2.