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I am getting these errors please help me in spark

Jun 12, 2014 10:45:51 PM org.jivesoftware.spark.util.log.Log error

SEVERE: Error unzipping plugin

java.io.FileNotFoundException: C:\Users\rajesh.jeedimalla\My Workspace_spark\Spark\bin (Access is denied)

at java.util.zip.ZipFile.open(Native Method)

at java.util.zip.ZipFile.(Unknown Source)

at java.util.zip.ZipFile.(Unknown Source)

at java.util.jar.JarFile.(Unknown Source)

at java.util.jar.JarFile.(Unknown Source)

at org.jivesoftware.sparkimpl.plugin.language.LanguagePlugin.initialize(LanguagePl ugin.java:75)

at org.jivesoftware.spark.PluginManager$2.run(PluginManager.java:662)

at java.awt.event.InvocationEvent.dispatch(Unknown Source)

at java.awt.EventQueue.dispatchEventImpl(Unknown Source)

at java.awt.EventQueue.access$200(Unknown Source)

at java.awt.EventQueue$3.run(Unknown Source)

at java.awt.EventQueue$3.run(Unknown Source)

at java.security.AccessController.doPrivileged(Native Method)

at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)

at java.awt.EventQueue.dispatchEvent(Unknown Source)

at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)

at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)

at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

at java.awt.EventDispatchThread.run(Unknown Source)

log4j:WARN No appenders could be found for logger (org.jivesoftware.smackx.jingle.nat.STUN).

log4j:WARN Please initialize the log4j system properly.

Jun 12, 2014 10:45:51 PM org.jivesoftware.spark.util.log.Log error

SEVERE:

java.lang.NullPointerException

at javax.swing.ImageIcon.(Unknown Source)

at org.jivesoftware.spark.roar.gui.RoarPreferencePanel.(RoarPreferencePanel. java:94)

at org.jivesoftware.spark.roar.RoarPreference.(RoarPreference.java:49)

at org.jivesoftware.spark.roar.Roar.initialize(Roar.java:37)

at org.jivesoftware.spark.PluginManager$2.run(PluginManager.java:662)

at java.awt.event.InvocationEvent.dispatch(Unknown Source)

at java.awt.EventQueue.dispatchEventImpl(Unknown Source)

at java.awt.EventQueue.access$200(Unknown Source)

at java.awt.EventQueue$3.run(Unknown Source)

at java.awt.EventQueue$3.run(Unknown Source)

at java.security.AccessController.doPrivileged(Native Method)

at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)

at java.awt.EventQueue.dispatchEvent(Unknown Source)

at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)

at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)

at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

at java.awt.EventDispatchThread.run(Unknown Source)