Fatal logminer error

Question

Why it is error in the first time ,and no error in the second time.
and in another oracle service there is not this problem.
please tell me why.
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SQL> execute dbms_logmnr.start_logmnr     
(dictfilename=>'e:\oracle\logs\dict.ora',
     starttime=>to_date('081128 14:00','yymmdd hh24:mi'),
     endtime=>to_date('081128 14:00','yymmdd hh24:mi'),
     options=>dbms_logmnr.continuous_mine);
BEGIN
     dbms_logmnr.start_logmnr     
(dictfilename=>'e:\oracle\logs\dict.ora',
     starttime=>to_date('081128 14:00','yymmdd hh24:mi'),
     endtime=>to_date('081128 14:00','yymmdd hh24:mi'),
     options=>dbms_logmnr.continuous_mine);
END;
第 1 行出现错误:
ORA-01280: Fatal LogMiner error。
ORA-06512: 在 "SYS.DBMS_LOGMNR", line 58
ORA-06512: 在 line 1
SQL> execute dbms_logmnr.start_logmnr     
(dictfilename=>'e:\oracle\logs\dict.ora',
     starttime=>to_date('081128 14:00','yymmdd hh24:mi'),
     endtime=>to_date('081128 14:00','yymmdd hh24:mi'),
     options=>dbms_logmnr.continuous_mine);
PL/SQL succcessful.
SQL>
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Answer 1

This forum is for the SQL Developer tool; you'll get more response in e.g. the Database - General forum...
Regards,
K.