The constructor of VrVideoView from Google Virtual reality

Question

When I call the constructor of VrVideoView, like:

VrVideoView view=new VrVideoView(this)

i catch this exception:

java.lang.AbstractMethodError: abstract method "com.google.vr.sdk.widgets.common.VrWidgetRenderer com.google.vr.sdk.widgets.common.VrWidgetView.createRenderer(android.content.Context, com.google.vr.sdk.widgets.common.VrWidgetRenderer$GLThreadScheduler, float, float)"