IHS6.1+WAS7.0.0.23,报Could not lock User prefs. Unix error code 24.错

IHS6.1+WAS7.0.0.23，报如下错误：
[13-1-24 0:44:11:627 CST] 000001a9 prefs         W   Could not lock User prefs. Unix error code 24.
[13-1-24 0:44:11:629 CST] 000001a9 prefs         W   Couldn't flush user prefs: java.util.prefs.BackingStoreException: Couldn't get file lock.

然后应用自己就停止了，请问这是什么问题呀，如何解决？