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java.lang.ClassNotFoundException: android.support.v4.content.ContextCompatApi21	at org.jetbrains.android.uipreview.ModuleClassLoader.load(ModuleClassLoader.java:127)	at com.android.tools.idea.rendering.RenderClassLoader.findClass(RenderClassLoader.java:53)	at org.jetbrains.android.uipreview.ModuleClassLoader.findClass(ModuleClassLoader.java:84)	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)	at android.support.v4.content.ContextCompat.getDrawable(ContextCompat.java:319)	at android.support.v7.internal.widget.TintManager.getDrawable(TintManager.java:137)	at android.support.v7.internal.widget.TintTypedArray.getDrawable(TintTypedArray.java:62)	at android.support.v7.widget.Toolbar.(Toolbar.java:250)	at android.support.v7.widget.Toolbar.(Toolbar.java:192)	at ar.com.lichtmaier.leyes.MiToolbar.(MiToolbar.java:17)	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)	at java.lang.reflect.Constructor.newInstance(Constructor.java:422)	at org.jetbrains.android.uipreview.ViewLoader.createNewInstance(ViewLoader.java:413)	at org.jetbrains.android.uipreview.ViewLoader.loadView(ViewLoader.java:105)	at com.android.tools.idea.rendering.LayoutlibCallback.loadView(LayoutlibCallback.java:177)	at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:207)	at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:132)	at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:806)	at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:64)	at android.view.LayoutInflater.rInflate(LayoutInflater.java:782)	at android.view.LayoutInflater.inflate(LayoutInflater.java:504)	at android.view.LayoutInflater.inflate(LayoutInflater.java:385)	at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:410)	at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:321)	at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:350)	at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:497)	at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:485)	at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:894)	at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:485)	at com.android.tools.idea.rendering.RenderTask.render(RenderTask.java:590)	at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager.doRender(AndroidLayoutPreviewToolWindowManager.java:644)	at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager.access$1700(AndroidLayoutPreviewToolWindowManager.java:79)	at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager$7$1.run(AndroidLayoutPreviewToolWindowManager.java:586)	at com.intellij.openapi.progress.impl.CoreProgressManager$2.run(CoreProgressManager.java:152)	at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:452)	at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:402)	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:54)	at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:137)	at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager$7.run(AndroidLayoutPreviewToolWindowManager.java:581)	at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:320)	at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:310)	at com.intellij.util.ui.update.MergingUpdateQueue$2.run(MergingUpdateQueue.java:254)	at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:269)	at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:227)	at com.intellij.util.ui.update.MergingUpdateQueue.run(MergingUpdateQueue.java:217)	at com.intellij.util.concurrency.QueueProcessor.runSafely(QueueProcessor.java:238)	at com.intellij.util.Alarm$Request$1.run(Alarm.java:351)	at java.util.concurrent.Executors$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)