spark error in the first logon

When spark starts up allways shows the next error, my openfire version is 4.1.1 and this error is happening since 3 versions ago of the openfire, and the spark version is 2.8.2 Build 934 and my java version is 8 version 111, it's making me crazy to me and to all my users.

java.lang.ExceptionInInitializerError

  at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

  at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)

  at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)

  at java.lang.reflect.Constructor.newInstance(Unknown Source)

  at java.lang.Class.newInstance(Unknown Source)

  at org.jivesoftware.launcher.Startup.start(Startup.java:83)

  at org.jivesoftware.launcher.Startup.main(Startup.java:43)

  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(LauncherEngine.java:65)

  at com.exe4j.runtime.WinLauncher.main(WinLauncher.java:101)

  at com.install4j.runtime.launcher.WinLauncher.main(WinLauncher.java:26)

Caused by: java.lang.NullPointerException

  at java.io.File.<init>(Unknown Source)

  at org.jivesoftware.Spark.initializeDirectory(Spark.java:97)

  at org.jivesoftware.Spark.getLogDirectory(Spark.java:405)

  at org.jivesoftware.spark.util.log.Log.<init>(Log.java:54)

  at org.jivesoftware.spark.util.log.Log.getInstance(Log.java:46)

  at org.jivesoftware.spark.util.log.Log.error(Log.java:108)

  at org.jivesoftware.spark.util.UIComponentRegistry.instantiate(UIComponentRegistry .java:509)

  at org.jivesoftware.spark.util.UIComponentRegistry.createChatContainer(UIComponent Registry.java:458)

  at org.jivesoftware.spark.ChatManager.<init>(ChatManager.java:133)

  at org.jivesoftware.spark.ChatManager.getInstance(ChatManager.java:120)

  at org.jivesoftware.spark.SparkManager.getChatManager(SparkManager.java:202)

  at org.jivesoftware.SparkStartupListener.startupPerformed(SparkStartupListener.jav a:34)

  at com.install4j.api.launcher.StartupNotification$ListenerAdapter.startupPerformed (StartupNotification.java:103)

  at com.exe4j.Controller.registerStartupListener(Controller.java:74)

  at com.install4j.api.launcher.StartupNotification.registerStartupListener(StartupN otification.java:37)

  at org.jivesoftware.Spark.<clinit>(Spark.java:291)

  ... 14 more