java.lang.ArrayIndexOutOfBoundsException: 31 at org.mapdb.DataInput2$ByteArray.unpackLongArray(DataInput2.java:200)

[sunyaf]

` // creo il db DB db = DBMaker.fileDB(path).fileLockDisable().closeOnJvmShutdown().checksumHeaderBypass().make();

    // Creo un insieme nel db
    HTreeMap.KeySet<String> hashSet = db.hashSet(setName).serializer(Serializer.STRING).createOrOpen();
    if (strings != null) {
        hashSet.addAll(strings);
    }
    db.close();`

exception java.lang.ArrayIndexOutOfBoundsException: 31 at org.mapdb.DataInput2$ByteArray.unpackLongArray(DataInput2.java:200)