Bug android studio preview

Bonjour, j'ai un bug dans android studio, tout marchais biens, mais maintenant je ne peut plus voir la preview du xml ! :/ J'ai comme erreur :
java.lang.NoClassDefFoundError: com/android/util/PropertiesMap

at com.android.layoutlib.bridge.android.BridgeContext.createStyleBasedTypedArray(BridgeContext.java:940)
	at com.android.layoutlib.bridge.android.BridgeContext.obtainStyledAttributes(BridgeContext.java:638)
	at android.content.res.Resources_Theme_Delegate.obtainStyledAttributes(Resources_Theme_Delegate.java:71)
	at android.content.res.Resources$Theme.obtainStyledAttributes(Resources.java:1436)
	at android.widget.TextView.<init>(TextView.java:761)
	at android.widget.TextView.<init>(TextView.java:704)
	at android.widget.TextView.<init>(TextView.java:700)
	at com.android.layoutlib.bridge.MockView.<init>(MockView.java:50)
	at com.android.layoutlib.bridge.MockView.<init>(MockView.java:45)
	at com.android.layoutlib.bridge.MockView.<init>(MockView.java:41)
	at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:163)
	at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:727)
	at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:858)
	at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:70)
	at android.view.LayoutInflater.rInflate(LayoutInflater.java:834)
	at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
	at com.android.layoutlib.bridge.bars.CustomBar.<init>(CustomBar.java:95)
	at com.android.layoutlib.bridge.bars.StatusBar.<init>(StatusBar.java:67)
	at com.android.layoutlib.bridge.impl.Layout.createStatusBar(Layout.java:222)
	at com.android.layoutlib.bridge.impl.Layout.<init>(Layout.java:144)
	at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:297)
	at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:429)
	at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:350)
	at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:520)
	at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:508)
	at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:967)
	at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:508)
	at com.android.tools.idea.rendering.RenderTask.access$600(RenderTask.java:75)
	at com.android.tools.idea.rendering.RenderTask$3.call(RenderTask.java:620)
	at com.android.tools.idea.rendering.RenderTask$3.call(RenderTask.java:617)
	at com.android.tools.idea.rendering.RenderService.runRenderAction(RenderService.java:371)
	at com.android.tools.idea.rendering.RenderTask.render(RenderTask.java:617)
	at com.android.tools.idea.rendering.RenderTask.render(RenderTask.java:639)
	at com.intellij.android.designer.designSurface.AndroidDesignerEditorPanel$7.run(AndroidDesignerEditorPanel.java:519)
	at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:337)
	at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:327)
	at com.intellij.util.ui.update.MergingUpdateQueue$3.run(MergingUpdateQueue.java:271)
	at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:286)
	at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:244)
	at com.intellij.util.ui.update.MergingUpdateQueue.run(MergingUpdateQueue.java:234)
	at com.intellij.util.concurrency.QueueProcessor.runSafely(QueueProcessor.java:238)
	at com.intellij.util.Alarm$Request$1.run(Alarm.java:352)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)

Donc merci si vous pouvez m'aider ...