Calling an oracle plsql procedure

Hi,

i am trying to call an Oracle plsql stored procedure from my page

but i keep getting the error:

ERROR [42000] [Oracle][ODBC][Ora]ORA-00900: invalid SQL statement

here's my code

OdbcConnection odbcConn = new OdbcConnection(connstring);
        string connstring = "Dsn=LDEV2;uid=PWRUSER;dbq=LDEV2;pwd=pwruser123";
        comm = "XX_FC_DATA_UPDATE_SUBTYPE";

        OdbcCommand odbcproc = new OdbcCommand(comm, odbcConn);
        odbcproc.CommandType = CommandType.StoredProcedure;
        odbcproc.Parameters.Add("P_UIDFCENTITY", OdbcType.Int).Value = uidfcent;
        odbcproc.Parameters.Add("P_YEAR", OdbcType.Int).Value = baseyear;
        odbcproc.Parameters.Add("P_UIDFCSUBSTATION", OdbcType.Int).Value = uidsubstn;
        odbcproc.Parameters.Add("P_UIDACCSUBTYPE", OdbcType.Int).Value = uidaccsubtype;
        odbcproc.Parameters.Add("P_UIDACCOUNT", OdbcType.Int).Value = 21;
        odbcproc.ExecuteScalar();

please, help

Thanks