Notes initialization failure - err 41728

hi, sometimes when i run my programm i become this exception. but only sometimes! i have no idea what the problem is.i connect to a server, this one connect with notes and send the data back to my program.

Exception

jvm 1 | java.lang.Exception: Notes initialization failure - err 41728

jvm 1 | at lotus.domino.NotesThread.NnotesInitThread(Native Method)

jvm 1 | at lotus.domino.NotesThread.sinitTermThread(Unknown Source)

jvm 1 | at lotus.domino.NotesThread.sinitThread(Unknown Source)

jvm 1 | at de.rznet.blackberryconnector.lotus.LotusNotesConnector.anmeld

en(LotusNotesConnector.java:98)

jvm 1 | at de.rznet.blackberryconnector.lotus.LotusNotesConnector.getAll

Select(LotusNotesConnector.java:283)

jvm 1 | at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

jvm 1 | at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAcces

sorImpl.java:39)

jvm 1 | at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMet

hodAccessorImpl.java:25)

jvm 1 | at java.lang.reflect.Method.invoke(Method.java:585)

jvm 1 | at de.rznet.blackberryconnector.Worker.aufruf(Worker.java:2794)

jvm 1 | at de.rznet.blackberryconnector.Worker.run(Worker.java:945)]