다이나믹 SQL을 사용하였는데 아래와 같은 오류가 납니다...무엇을 잘못되었나요

    EXEC    SQL BEGIN   DECLARE SECTION;
        char            stmt[512];
    EXEC    SQL END     DECLARE SECTION;

    memset( stmt, 0x00 , sizeof(stmt) );
    if( gArgc == 2 )
        strcpy( stmt , "SELECT org_cd FROM EFMS_ORGMAST WHERE oper_gb='1' ORDER BY org_cd ASC" );
    else if( gArgc == 3 )
        sprintf( stmt , "SELECT org_cd FROM EFMS_ORGMAST WHERE oper_gb='1' AND org_cd = %s ORDER BY org_cd ASC",

                              gOpenOrgCd );

    EXEC SQL PREPARE sql_stmt FROM :stmt;

    EXEC SQL DECLARE cur_orgmast CURSOR FOR sql_stmt;   

    if ( SQLCODE != OK ) {
        FDUMP(PNAME, "%d:%s\n", SQLCODE, SQLERRM);
        return( NK );
    }

오류내용:

-16843143:ct_dynamic(CURSOR_DECLARE): user api layer: external error: The specified id does not exist on this connection.