在使用HSQLDB时报错

[franic1121]

错误信息：
Caused by: org.hsqldb.HsqlException: Database lock acquisition failure: lockFile: org.hsqldb.persist.LockFile@4facc966[file =C:\Users\user\Documents\hsqldb\data\database.lck, exists=true, locked=false, valid=false, ] method: checkHeartbeat read: 2011-11-12 04:04:19 heartbeat - read: -1941 ms.
at org.hsqldb.error.Error.error(Error.java:77)
at org.hsqldb.persist.LockFile.newLockFileLock(LockFile.java:642)
at org.hsqldb.persist.Logger.acquireLock(Logger.java:1076)
at org.hsqldb.persist.Logger.openPersistence(Logger.java:284)
at org.hsqldb.Database.reopen(Database.java:220)
at org.hsqldb.Database.open(Database.java:186)
at org.hsqldb.DatabaseManager.getDatabase(DatabaseManager.java:240)
at org.hsqldb.DatabaseManager.newSession(DatabaseManager.java:157)
at org.hsqldb.jdbc.JDBCConnection.<init>(JDBCConnection.java:3281)


开始操作是没有问题的，可等吃玩饭回来后，再次创建表就报这个错，有没有哪位同志也遇到过，求解。