title: Android Studio ConstraintLayout alpha 9 onMeasure error
body: <p>im using ConstraintLayout alpha 9 to build my layout
  when i was on alpha 8 its says obsolete layout but when i updated to alpha 9 i gen onMeasure error
  this is the error code </p>
  
  <pre><code>java.lang.NoSuchMethodError: android.support.constraint.solver.widgets.ConstraintWidget.setHorizontalWeight(F)V
  at android.support.constraint.ConstraintLayout.setChildrenConstraints(ConstraintLayout.java:675)
  at android.support.constraint.ConstraintLayout.updateHierarchy(ConstraintLayout.java:468)
  at android.support.constraint.ConstraintLayout.onMeasure_Original(ConstraintLayout.java:770)
  at android.support.constraint.ConstraintLayout.onMeasure(ConstraintLayout.java)
  at android.view.View.measure(View.java:19731)
  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)
  at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
  at android.support.v7.widget.ContentFrameLayout.onMeasure_Original(ContentFrameLayout.java:135)
  at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java)
  at android.view.View.measure(View.java:19731)
  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)
  at android.support.v7.widget.ActionBarOverlayLayout.onMeasure_Original(ActionBarOverlayLayout.java:391)
  at android.support.v7.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java)
  at android.view.View.measure(View.java:19731)
  at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715)
  at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
  at android.view.View.measure(View.java:19731)
  at com.android.layoutlib.bridge.impl.RenderSessionImpl.measureView(RenderSessionImpl.java:545)
  at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:342)
  at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:429)
  at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:389)
  at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:548)
  at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:533)
  at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:966)
  at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:533)
  at com.android.tools.idea.rendering.RenderTask.lambda$inflate$72(RenderTask.java:659)
  at java.util.concurrent.FutureTask.run(FutureTask.java:266)
  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
  at java.lang.Thread.run(Thread.java:745)
  </code></pre>
  
  <p>any solution</p>