John - 2007-11-29

2007-11-29 16:09:59,093 ERROR (jcrontab:95) - java.lang.NullPointerException
java.lang.NullPointerException
        at java.io.Reader.<init>(Reader.java:61)
        at java.io.InputStreamReader.<init>(InputStreamReader.java:55)
        at org.jcrontab.data.FileSource.findAll(FileSource.java:130)
        at org.jcrontab.data.CrontabEntryDAO.findAll(CrontabEntryDAO.java:83)
        at org.jcrontab.Cron.readCrontab(Cron.java:241)
        at org.jcrontab.Cron.generateTasks(Cron.java:256)
        at org.jcrontab.Cron.run(Cron.java:184)

who can tell me what's wrong?