Crashlytics Android Studio Can't run: NoClassDefFoundError: javax/swing/SwingUtilities

I'm working with android studio 0.5.4. I try to install crashlytics plugin. I have download it and got CrashlyticsAndroidStudioPlugin.zip. I have installed it `setttings > Plugins > Install plugin form disk > "OK".` the crashlytics button has appeared on the toolbar. But when I select myAndroidProject then click "the red crashlytics button" I got these error message: ``` [ 596982] ERROR - llij.ide.plugins.PluginManager - javax/swing/SwingUtilities java.lang.NoClassDefFoundError: javax/swing/SwingUtilities at com.crashlytics.tools.ide.app.Launcher.asyncShowShell(Launcher.java:1 16) at com.crashlytics.tools.intellij.app.CrashlyticsBridgeImpl.asyncShowPar entedShell(CrashlyticsBridgeImpl.java:179) at com.crashlytics.tools.intellij.app.CrashlyticsBridgeImpl.access$000(C rashlyticsBridgeImpl.java:36) at com.crashlytics.tools.intellij.app.CrashlyticsBridgeImpl$2.setSelecte d(CrashlyticsBridgeImpl.java:168) at com.crashlytics.tools.intellij.actions.CrashlyticsAction.setSelected( CrashlyticsAction.java:59) at com.intellij.openapi.actionSystem.ToggleAction.actionPerformed(Toggle Action.java:42) at com.intellij.openapi.actionSystem.ex.ActionUtil.performActionDumbAwar e(ActionUtil.java:164) at com.intellij.openapi.actionSystem.impl.ActionButton.actionPerformed(A ctionButton.java:170) at com.intellij.openapi.actionSystem.impl.ActionButton.performAction(Act ionButton.java:133) at com.intellij.openapi.actionSystem.impl.ActionButton.processMouseEvent (ActionButton.java:311) at java.awt.Component.processEvent(Component.java:6292) at java.awt.Container.processEvent(Container.java:2234) at java.awt.Component.dispatchEventImpl(Component.java:4883) at java.awt.Container.dispatchEventImpl(Container.java:2292) at java.awt.Component.dispatchEvent(Component.java:4705) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4898 ) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4533) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4462) at java.awt.Container.dispatchEventImpl(Container.java:2278) at java.awt.Window.dispatchEventImpl(Window.java:2739) at java.awt.Component.dispatchEvent(Component.java:4705) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:746) at java.awt.EventQueue.access$400(EventQueue.java:97) at java.awt.EventQueue$3.run(EventQueue.java:697) at java.awt.EventQueue$3.run(EventQueue.java:691) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDo main.java:75) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDo main.java:86) at java.awt.EventQueue$4.run(EventQueue.java:719) at java.awt.EventQueue$4.run(EventQueue.java:717) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDo main.java:75) at java.awt.EventQueue.dispatchEvent(EventQueue.java:716) at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.jav a:697) at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:520) at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:335) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThre ad.java:201) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread. java:116) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre ad.java:105) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) at java.awt.EventDispatchThread.run(EventDispatchThread.java:82) Caused by: java.lang.ClassNotFoundException: javax.swing.SwingUtilities not foun d by com.crashlytics.tools.intellij.core [1] at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDele gation(BundleWiringImpl.java:1460) at org.apache.felix.framework.BundleWiringImpl.access$400(BundleWiringIm pl.java:72) at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadCla ss(BundleWiringImpl.java:1843) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 42 more [ 597364] ERROR - llij.ide.plugins.PluginManager - Android Studio (Preview) 0.5 .4 Build #AI-135.1101912 [ 597365] ERROR - llij.ide.plugins.PluginManager - JDK: 1.8.0 [ 597366] ERROR - llij.ide.plugins.PluginManager - VM: Java HotSpot(TM) Server VM [ 597367] ERROR - llij.ide.plugins.PluginManager - Vendor: Oracle Corporation [ 597368] ERROR - llij.ide.plugins.PluginManager - OS: Windows 7 [ 597368] ERROR - llij.ide.plugins.PluginManager - Last Action: Actions.Crashly tics.CrashlyticsAction ``` Can Anybody help me? have you ever got these error message? FYI: I'm using windows 7 and using `java jdk1.8.0.`