Traccar doesn´t start - please help

Hello,

I have Traccar running some time, but now it won´t start on raspberry.
My wrapper log:

INFO   | jvm 1    | 2015/10/03 01:44:43 | WrapperSimpleApp Error:       at org.traccar.database.ConnectionManager.<init>(ConnectionManager.java:41)
INFO   | jvm 1    | 2015/10/03 01:44:43 | WrapperSimpleApp Error:       at org.traccar.Context.init(Context.java:102)
INFO   | jvm 1    | 2015/10/03 01:44:43 | WrapperSimpleApp Error:       at org.traccar.Main.main(Main.java:26)
INFO   | jvm 1    | 2015/10/03 01:44:43 | WrapperSimpleApp Error:       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
INFO   | jvm 1    | 2015/10/03 01:44:43 | WrapperSimpleApp Error:       at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
INFO   | jvm 1    | 2015/10/03 01:44:43 | WrapperSimpleApp Error:       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
INFO   | jvm 1    | 2015/10/03 01:44:43 | WrapperSimpleApp Error:       at java.lang.reflect.Method.invoke(Method.java:606)
INFO   | jvm 1    | 2015/10/03 01:44:43 | WrapperSimpleApp Error:       at org.tanukisoftware.wrapper.WrapperSimpleApp.run(WrapperSimpleApp.java:325)
INFO   | jvm 1    | 2015/10/03 01:44:43 | WrapperSimpleApp Error:       at java.lang.Thread.run(Thread.java:745)
STATUS | wrapper  | 2015/10/03 01:44:45 | <-- Wrapper Stopped

What version are you using? What's the exception in the log?

My version is 3.1.
With Internet Explorer everything is ok. Since last Update Firefox don´t want open --> only white Side

Does it mean Traccar runs now without problems?

As for Firefox, try to clear cache and see if it helps. If not, you need to check browser console to see what's going wrong there.

Yes, now it runs.

But I don´t know really what the Problem was ...

That's why I asked to provide full stack trace from the log including exception type.