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android.support.design.widget.CollapsingToolbarLayout: 	at android.view.LayoutInflater.inflate(LayoutInflater.java:539)	at android.view.LayoutInflater.inflate(LayoutInflater.java:423)	at android.view.LayoutInflater.inflate(LayoutInflater.java:374)	at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:280)	at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)	at ir.pishguy.signalpresentationproject.Activities.ActivityMain.onCreate(ActivityMain.java:52)	at android.app.Activity.performCreate(Activity.java:6285)	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1108)	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2417)	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2524)	at android.app.ActivityThread.access$900(ActivityThread.java:154)	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1391)	at android.os.Handler.dispatchMessage(Handler.java:102)	at android.os.Looper.loop(Looper.java:234)	at android.app.ActivityThread.main(ActivityThread.java:5526)	at java.lang.reflect.Method.invoke(Native Method)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)