Dead lock detected in alert log for HTMLDB application

We have a HTMLDB application newly impletemented in our database. One day, I found a ORA-000060 deadlock detected message in database alert log. Our developer said that the application is only for users to query something and will not insert, update or delete anything. I have created a tar but still not found any problem cause this. Can anyone tell why this occur?
Thanks in advance,
Antony
*** SESSION ID:(289.143) 2005-11-17 10:35:48.976
DEADLOCK DETECTED
Current SQL statement for this session:
DELETE FROM WWV_FLOW_DATA WHERE FLOW_INSTANCE = :B1 AND ITEM_ID IN (SELECT ID FROM WWV_FLOW_PAGE_PLUGS WHERE FLOW_ID = :B3 AND PAGE_ID = :B2 AND PLUG_SOURCE_TYPE IN ( 'SIMPLE_CHART', 'UPDATABLE_SQL_QUERY', 'DBMSSQL_CURSOR', 'FUNCTION_RETURNING_DBMSSQL_CURSOR', 'FUNCTION_RETURNING_SQL_QUERY_CACHED', 'FUNCTION_RETURNING_SQL_QUERY', 'STRUCTURED_QUERY', 'SQL_QUERY'))
----- PL/SQL Call Stack -----
object line object
handle number name
7000000bb989300 228 package body FLOWS_020000.WWV_FLOW_DISP_PAGE_PLUGS
7000000bbc922c8 8961 package body FLOWS_020000.WWV_FLOW
7000000bbd00000 236 procedure FLOWS_020000.F
7000000bdf1baa0 8 anonymous block
The following deadlock is not an ORACLE error. It is a
deadlock due to user error in the design of an application
or from issuing incorrect ad-hoc SQL. The following
information may aid in determining the deadlock:
Deadlock graph:
---------Blocker(s)-------- ---------Waiter(s)---------
Resource Name process session holds waits process session holds waits
TX-00050005-00756507 308 289 X 295 276 X
TX-0002000f-006fc0df 295 276 X 308 289 X
session 289: DID 0001-0134-00000005     session 276: DID 0001-0127-00000002
session 276: DID 0001-0127-00000002     session 289: DID 0001-0134-00000005

Rakesh,
Please see if (ora-600 [12333] / ora-3137 [12333] Troubleshooting [ID 828123.1]) and/or (ORA-600 [12333] "Fatal Two-Task Protocol Violation" [ID 35928.1]) is applicable.
Did you try to bounce the database and see if you can reproduce the issue?
If you still encounter the same error, please log a SR.
Thanks,
Hussein

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