ORA-13639: The C operation was interrupted because it timed OUT

Errors in file u01/app/oracle/diag/rdbms/wlpub/wlpub1/trace/wlpub1_j001_215130.trc:
ORA-13639: The current operation was interrupted because it timed out.
End automatic SQL Tuning Advisor run for special tuning task  "SYS_AUTO_SQL_TUNING_TASK"
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DECLARE 
  l_sql_tune_task_id CLOB; 
BEGIN 
  l_sql_tune_task_id := DBMS_SQLTUNE.create_tuning_task ( 
                          begin_snap =>,
                          end_snap =>,
                          sql_id => '',
                          scope => DBMS_SQLTUNE.scope_comprehensive, 
                          time_limit =>3600, 
                          task_name => '',
                          description => 'Tuning task for statement SYS_AUTO_SQL_TUNING_TASK  in AWR.');
  DBMS_OUTPUT.put_line('l_sql_tune_task_id: ' || l_sql_tune_task_id); 
END; 
/
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BEGIN
DBMS_SQLTUNE.SET_TUNING_TASK_PARAMETER(task_name => ' SYS_AUTO_SQL_TUNING_TASK ', parameter => 'TIME_LIMIT', value => 7200);
END;
/
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