Hello i make bots in java but i have this error: http://scr.hu/1det/ses73 (this message is multy because i have 3 bots and all send this warning)

when i try save player i have this error;/'
code to save players(fragment)
[code=java]
Client c = HelperBot.api.getClientByUId(u.getUid());
Long playTime = System.currentTimeMillis() - u.getJoinTime();
u.setTime(playTime + u.getTime());
u.setJoinTime(System.currentTimeMillis());
Long idle = (c.getIdleTime() + u.getIdleTime()) - u.getIdleTimeAdd();
u.setIdleTime(idle);
u.setIdleTimeAdd(c.getIdleTime());
if (System.currentTimeMillis() - u.getLastSave() > TimeUnit.SECONDS.toMillis(60)) {
u.setLastSave(System.currentTimeMillis());
HelperBot.api.sendPrivateMessage(HelperBot.api.get ClientByUId("XsLJ0WpmORHxQCNB2QV7jXUiAfU=").getId( ), "[name= " + u.getName()
+ ",time(sec)= " + TimeUnit.MICROSECONDS.toSeconds(u.getTime())
+ ",idleTime(sec)= " + TimeUnit.MICROSECONDS.toSeconds(u.getIdleTime()));
System.out.println("zapisuje gracza");
u.save();
}
[/code]