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Trouble starting Spark

Greetings,

until today Spark worked just fine. But after i played around with some checkboxes at the connection settings,

a debug window popped out, the whole thing froze and since then i just cannot start the program anymore.

Deinstalling and re-installing didnt work, i cant find a way to reset the startup settings.

The Output.log contains:

Debug is true storeKey false useTicketCache true useKeyTab false doNotPrompt true ticketCache is null isInitiator true KeyTab is null refreshKrb5Config is false principal is null tryFirstPass is false useFirstPass is false storePass is false clearPass is false
Acquire TGT from Cache
Principal is null
null credentials from Ticket Cache
[Krb5LoginModule] authentication failed
Unable to obtain Princpal Name for authentication

The Error.log says:

java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jivesoftware.launcher.Startup.start(Startup.java:83)
at org.jivesoftware.launcher.Startup.main(Startup.java:33)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.exe4j.runtime.LauncherEngine.launch(Unknown Source)
at com.exe4j.runtime.WinLauncher.main(Unknown Source)
Caused by: java.lang.NullPointerException
at java.util.Hashtable.put(Unknown Source)
at java.util.Properties.setProperty(Unknown Source)
at java.lang.System.setProperty(Unknown Source)
at org.jivesoftware.LoginDialog$LoginPanel.useSSO(LoginDialog.java:709)
at org.jivesoftware.LoginDialog$LoginPanel.(LoginDialog.java:390)
at org.jivesoftware.LoginDialog.invoke(LoginDialog.java:133)
at org.jivesoftware.Spark.startup(Spark.java:165)
… 12 more

Can anyone help?

You could delete settings folder (/home/YourName/.Spark in linux)
Or in Windows:

C:\Documents and Settings\YourName\Application Data\Spark

.