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Store being constructed on deleted area

Hello. I'm heavy testing my application and I'm getting this:
---- debug.log ----
...
% Dropped: 11574nicarran_ejb_CustomField
% Dropped: 11573nicarran_ejb_CustomField
% Dropped: 11576nicarran_ejb_CustomField
% java.io.IOException: Store being constructed on deleted area.
	at com.mckoi.store.AbstractStore$StoreArea.<init>(AbstractStore.java:1513)
	at com.mckoi.store.AbstractStore.getArea(AbstractStore.java:1406)
	at 
com.mckoi.database.IndexSetStore$MappedListBlock.getArray(IndexSetStore.java:1022)
	at 
com.mckoi.util.BlockIntegerList$IntArrayListBlock.searchFirst(BlockIntegerList.java:356)
	at 
com.mckoi.util.AbstractBlockIntegerList.searchFirst(AbstractBlockIntegerList.java:1049)
	at com.mckoi.database.InsertSearch.searchFirst(InsertSearch.java:351)
	at 
com.mckoi.database.CollatedBaseSearch.positionOfRangePoint(CollatedBaseSearch.java:192)
	at 
com.mckoi.database.CollatedBaseSearch.addRange(CollatedBaseSearch.java:272)
	at 
com.mckoi.database.CollatedBaseSearch.selectRange(CollatedBaseSearch.java:290)
	at 
com.mckoi.database.SelectableScheme.selectEqual(SelectableScheme.java:390)
	at 
com.mckoi.database.TableDataConglomerate.isUniqueColumns(TableDataConglomerate.java:1691)
	at 
com.mckoi.database.TableDataConglomerate.checkAddConstraintViolations(TableDataConglomerate.java:1958)
	at 
com.mckoi.database.MasterTableDataSource$MMutableTableDataSource.constraintIntegrityCheck(MasterTableDataSource.java:1922)
	at com.mckoi.database.DataTable.add(DataTable.java:180)
	at com.mckoi.database.interpret.Insert.evaluate(Insert.java:269)
	at 
com.mckoi.database.interpret.SQLQueryExecutor.execute(SQLQueryExecutor.java:147)
	at 
com.mckoi.database.jdbcserver.AbstractJDBCDatabaseInterface.execQuery(AbstractJDBCDatabaseInterface.java:461)
	at 
com.mckoi.database.jdbcserver.JDBCDatabaseInterface.execQuery(JDBCDatabaseInterface.java:251)
	at 
com.mckoi.database.jdbcserver.JDBCProcessor.queryCommand(JDBCProcessor.java:352)
	at 
com.mckoi.database.jdbcserver.JDBCProcessor.processQuery(JDBCProcessor.java:293)
	at 
com.mckoi.database.jdbcserver.JDBCProcessor.processJDBCCommand(JDBCProcessor.java:196)
	at 
com.mckoi.database.jdbcserver.StreamJDBCServerConnection.processRequest(StreamJDBCServerConnection.java:133)
	at 
com.mckoi.database.jdbcserver.MultiThreadedConnectionPoolServer$1.run(MultiThreadedConnectionPoolServer.java:171)
	at com.mckoi.database.WorkerThread.run(WorkerThread.java:123)
>com.mckoi.database.jdbcserver.JDBCDatabaseInterface ( lvl: 20 )
  Exception thrown during query processing on: [ Query:
[ INSERT INTO RT_CustomRange_CustomType(CustomType_className, 
CustomRange_id) VALUES (?, ?) ]

Params:
[ java.lang.String, fc1b69c7de_ee33ffae,  ]
]
[ TIME: Sat Apr 24 02:27:56 COT 2004 ]
% java.lang.Error: IO Error: Store being constructed on deleted area.
	at 
com.mckoi.database.IndexSetStore$MappedListBlock.getArray(IndexSetStore.java:1026)
	at 
com.mckoi.util.BlockIntegerList$IntArrayListBlock.searchFirst(BlockIntegerList.java:356)
	at 
com.mckoi.util.AbstractBlockIntegerList.searchFirst(AbstractBlockIntegerList.java:1049)
	at com.mckoi.database.InsertSearch.searchFirst(InsertSearch.java:351)
	at 
com.mckoi.database.CollatedBaseSearch.positionOfRangePoint(CollatedBaseSearch.java:192)
	at 
com.mckoi.database.CollatedBaseSearch.addRange(CollatedBaseSearch.java:272)
	at 
com.mckoi.database.CollatedBaseSearch.selectRange(CollatedBaseSearch.java:290)
	at 
com.mckoi.database.SelectableScheme.selectEqual(SelectableScheme.java:390)
	at 
com.mckoi.database.TableDataConglomerate.isUniqueColumns(TableDataConglomerate.java:1691)
	at 
com.mckoi.database.TableDataConglomerate.checkAddConstraintViolations(TableDataConglomerate.java:1958)
	at 
com.mckoi.database.MasterTableDataSource$MMutableTableDataSource.constraintIntegrityCheck(MasterTableDataSource.java:1922)
	at com.mckoi.database.DataTable.add(DataTable.java:180)
	at com.mckoi.database.interpret.Insert.evaluate(Insert.java:269)
	at 
com.mckoi.database.interpret.SQLQueryExecutor.execute(SQLQueryExecutor.java:147)
	at 
com.mckoi.database.jdbcserver.AbstractJDBCDatabaseInterface.execQuery(AbstractJDBCDatabaseInterface.java:461)
	at 
com.mckoi.database.jdbcserver.JDBCDatabaseInterface.execQuery(JDBCDatabaseInterface.java:251)
	at 
com.mckoi.database.jdbcserver.JDBCProcessor.queryCommand(JDBCProcessor.java:352)
	at 
com.mckoi.database.jdbcserver.JDBCProcessor.processQuery(JDBCProcessor.java:293)
	at 
com.mckoi.database.jdbcserver.JDBCProcessor.processJDBCCommand(JDBCProcessor.java:196)
	at 
com.mckoi.database.jdbcserver.StreamJDBCServerConnection.processRequest(StreamJDBCServerConnection.java:133)
	at 
com.mckoi.database.jdbcserver.MultiThreadedConnectionPoolServer$1.run(MultiThreadedConnectionPoolServer.java:171)
	at com.mckoi.database.WorkerThread.run(WorkerThread.java:123)
% Dropped: 11577nicarran_ejb_CustomField
% Dropped: 11578nicarran_ejb_CustomField
% Dropped: 11579nicarran_ejb_CustomField
...

---- debug.log ----
What does this mean?
And after a while the mckoi db appers to be locked. It does not respond to 
clients.
Is it my app doing something wrong or is it mckoi?
The last lines of my debug.log are:
----
...
[ TIME: Sat Apr 24 02:48:27 COT 2004 ]
% java.net.SocketException: Socket closed
	at java.net.SocketInputStream.socketRead0(Native Method)
	at java.net.SocketInputStream.read(SocketInputStream.java:129)
	at 
com.mckoi.util.LengthMarkedBufferedInputStream.blockForCommand(LengthMarkedBufferedInputStream.java:271)
	at 
com.mckoi.database.jdbcserver.StreamJDBCServerConnection.blockForRequest(StreamJDBCServerConnection.java:164)
	at 
com.mckoi.database.jdbcserver.MultiThreadedConnectionPoolServer$ClientThread.checkCurrentConnection(MultiThreadedConnectionPoolServer.java:162)
	at 
com.mckoi.database.jdbcserver.MultiThreadedConnectionPoolServer$ClientThread.run(MultiThreadedConnectionPoolServer.java:236)
[ TIME: Sat Apr 24 02:48:27 COT 2004 ]
% java.io.IOException: Stream closed.
	at java.net.PlainSocketImpl.available(PlainSocketImpl.java:397)
	at java.net.SocketInputStream.available(SocketInputStream.java:217)
	at 
com.mckoi.util.LengthMarkedBufferedInputStream.pollForCommand(LengthMarkedBufferedInputStream.java:191)
	at 
com.mckoi.database.jdbcserver.StreamJDBCServerConnection.requestPending(StreamJDBCServerConnection.java:109)
	at 
com.mckoi.database.jdbcserver.StreamJDBCServerConnection.processRequest(StreamJDBCServerConnection.java:148)
	at 
com.mckoi.database.jdbcserver.MultiThreadedConnectionPoolServer$1.run(MultiThreadedConnectionPoolServer.java:171)
	at com.mckoi.database.WorkerThread.run(WorkerThread.java:123)
>com.mckoi.database.jdbcserver.MultiThreadedConnectionPoolServer$ClientThread 
>( lvl: 20 )
  IOException generated while checking connections, removing provider.
[ TIME: Sat Apr 24 02:48:27 COT 2004 ]
% java.net.SocketException: Socket closed
	at java.net.SocketInputStream.socketRead0(Native Method)
	at java.net.SocketInputStream.read(SocketInputStream.java:129)
	at 
com.mckoi.util.LengthMarkedBufferedInputStream.blockForCommand(LengthMarkedBufferedInputStream.java:271)
	at 
com.mckoi.database.jdbcserver.StreamJDBCServerConnection.blockForRequest(StreamJDBCServerConnection.java:164)
	at 
com.mckoi.database.jdbcserver.MultiThreadedConnectionPoolServer$ClientThread.checkCurrentConnection(MultiThreadedConnectionPoolServer.java:162)
	at 
com.mckoi.database.jdbcserver.MultiThreadedConnectionPoolServer$ClientThread.run(MultiThreadedConnectionPoolServer.java:236)
[ TIME: Sat Apr 24 02:48:27 COT 2004 ]
% java.io.IOException: Stream closed.
	at java.net.PlainSocketImpl.available(PlainSocketImpl.java:397)
	at java.net.SocketInputStream.available(SocketInputStream.java:217)
	at 
com.mckoi.util.LengthMarkedBufferedInputStream.pollForCommand(LengthMarkedBufferedInputStream.java:191)
	at 
com.mckoi.database.jdbcserver.StreamJDBCServerConnection.requestPending(StreamJDBCServerConnection.java:109)
	at 
com.mckoi.database.jdbcserver.StreamJDBCServerConnection.processRequest(StreamJDBCServerConnection.java:148)
	at 
com.mckoi.database.jdbcserver.MultiThreadedConnectionPoolServer$1.run(MultiThreadedConnectionPoolServer.java:171)
	at com.mckoi.database.WorkerThread.run(WorkerThread.java:123)
>com.mckoi.database.jdbcserver.MultiThreadedConnectionPoolServer$ClientThread 
>( lvl: 20 )
  IOException generated while checking connections, removing provider.
[ TIME: Sat Apr 24 02:48:27 COT 2004 ]
% java.net.SocketException: Socket closed
	at java.net.SocketInputStream.socketRead0(Native Method)
	at java.net.SocketInputStream.read(SocketInputStream.java:129)
	at 
com.mckoi.util.LengthMarkedBufferedInputStream.blockForCommand(LengthMarkedBufferedInputStream.java:271)
	at 
com.mckoi.database.jdbcserver.StreamJDBCServerConnection.blockForRequest(StreamJDBCServerConnection.java:164)
	at 
com.mckoi.database.jdbcserver.MultiThreadedConnectionPoolServer$ClientThread.checkCurrentConnection(MultiThreadedConnectionPoolServer.java:162)
	at 
com.mckoi.database.jdbcserver.MultiThreadedConnectionPoolServer$ClientThread.run(MultiThreadedConnectionPoolServer.java:236)
----
Thanks.

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