Error 8201 (Database version not available) during ODatabase() in VC++

Question

Hello all,
I'm Beginner and i think i have a stupid problem,
when i execute under VC++ V6 SP5 (and IE 5.5 SP2) Under W98se :
OStartup();
ODatabase odb("essai","SYSTEM","manager"); // 'essai' is an existing database, no problem with sql*plus
if (!odb.IsOpen()) {
long err = odb.ErrorNumber();
char chaine[100];
sprintf(chaine,"Error n0=%ld",err);
::MessageBox(0,chaine,"DataBase",0);
Displaying 'Error n08201' : 'Database version not available' ???
PLEASE, THIS PROBLEM TURN ON MY MIND DURING ALL THIS WEEK-END AND I TEST, I RELEASE, I SEARCHE, AND NOTING...

Answer 1

My Reponse from My Question :
It was so easy to run 'lsnrctl start'.
(Listen Module Manager).
2 days to find this.
VB doesn't work anymore.
I've executed an pre-compiled example 'login.exe' which display --> 'No Listen Module'.
Bye All.