unable to get pkcs11 module dll from thunderbird profiles

After calling this function - SECMOD_OpenUserDB getting error like "No Error"

here the source code-


/*  samp.cpp  */
//------------------------------------------------------
PK11SlotInfo    *sltinf     = NULL;
char            *libname    = "";
char            *modspec    = "configdir='.\\AppData\\Roaming\\Thunderbird\\Profiles' secmod=secmod.db tokenDescription='PKCS11 Module' flags= readOnly"
HRESULT         hr          = S_OK;


hr = NSS_Initialize( moduleSpec, "", "", NULL , NSS_INIT_READONLY );

if (hr != S_OK)
{
    printf("initialization failed due to %s \n",moduleSpec);
    __leave;
}

sltinf = SECMOD_OpenUserDB( modspec );
if ( NULL == sltinf )
{
    perror("::SECMOD_OpenUserDB::");
    __leave;
} // if

libname = sltinf->module->dllName;

printf( "Obtained lib name: %s\n", libname );

SECMOD_CloseUserDB( sltinf );

//------------------------------------------------------

Here i am getting nothing in "sltinf" 
Included all nss specific headers which are required for code.
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