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You need to use a Theme.AppCompat theme (or descendant) with the design library.
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You need to use a Theme.AppCompat theme (or descendant) with the design library.
java.lang.IllegalArgumentException: You need to use a Theme.AppCompat theme (or descendant) with the design library. at android.support.design.widget.ThemeUtils.checkAppCompatTheme(ThemeUtils.java:36) at android.support.design.widget.CoordinatorLayout.<init>(CoordinatorLayout.java:185) at android.support.design.widget.CoordinatorLayout.<init>(CoordinatorLayout.java:179) 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:423) at org.jetbrains.android.uipreview.ViewLoader.createNewInstance(ViewLoader.java:465) at org.jetbrains.android.uipreview.ViewLoader.loadClass(ViewLoader.java:172) at org.jetbrains.android.uipreview.ViewLoader.loadView(ViewLoader.java:105) at com.android.tools.idea.rendering.LayoutlibCallbackImpl.loadView(LayoutlibCallbackImpl.java:176) at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:247) at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:171) at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:727) at android.view.LayoutInflater.inflate(LayoutInflater.java:495) at android.view.LayoutInflater.inflate(LayoutInflater.java:397) at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:317) 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)