android - Error inflating class set in xml -

i'm trying create textview slides screen , creates error, don't know why. xml:

<set xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     android:fillafter="true">      <scale         android:duration="500"         android:fromxscale="1.0"         android:fromyscale="1.0"         android:interpolator="@android:anim/linear_interpolator"         android:toxscale="1.0"         android:toyscale="0.0" />      <textview         android:id="@+id/scroll_message"         android:text="@string/scroll_text"         android:layout_width="fill_parent"         android:layout_height="fill_parent"         android:layout_gravity="center"         android:minlines="1"         android:maxlines="10"         android:width="250dp"         android:textcolor="@android:color/black"         android:textstyle="bold" />  </set> 

and activty class:

package com.example.rsa.myapplication;  import android.app.activity;   import android.os.bundle; import android.text.method.scrollingmovementmethod; import android.view.menu; import android.view.menuitem; import android.view.view; import android.content.intent; import android.widget.edittext; import android.widget.textview; import android.widget.scrollview;   public class myactivity extends activity {      @override     protected void oncreate(bundle savedinstancestate) {          super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_my);       //textview txt = (textview) findviewbyid(r.id.scroll_message); }       @override     public boolean oncreateoptionsmenu(menu menu) {          getmenuinflater().inflate(r.menu.activity_my, menu);         return true;     } } 

the error given is:

            09-10 09:02:47.117  31292-31292/com.example.rsa.myapplication e/androidruntime﹕ fatal exception: main process: com.example.rsa.myapplication, pid: 31292 java.lang.runtimeexception: unable start activity componentinfo{com.example.rsa.myapplication/com.example.rsa.myapplication.myactivity}: android.view.inflateexception: binary xml file line #1: error inflating class set         @ android.app.activitythread.performlaunchactivity(activitythread.java:2255)         @ android.app.activitythread.handlelaunchactivity(activitythread.java:2317)         @ android.app.activitythread.access$800(activitythread.java:143)         @ android.app.activitythread$h.handlemessage(activitythread.java:1258)         @ android.os.handler.dispatchmessage(handler.java:102)         @ android.os.looper.loop(looper.java:135)         @ android.app.activitythread.main(activitythread.java:5070)         @ java.lang.reflect.method.invoke(native method)         @ java.lang.reflect.method.invoke(method.java:372)         @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:836)         @ com.android.internal.os.zygoteinit.main(zygoteinit.java:631)  caused by: android.view.inflateexception: binary xml file line #1: error inflating class set         @ android.view.layoutinflater.createviewfromtag(layoutinflater.java:753)         @ android.view.layoutinflater.inflate(layoutinflater.java:478)         @ android.view.layoutinflater.inflate(layoutinflater.java:410)         @ android.view.layoutinflater.inflate(layoutinflater.java:361)         @ com.android.internal.policy.impl.phonewindow.setcontentview(phonewindow.java:350)         @ android.app.activity.setcontentview(activity.java:2122)         @ com.example.ranjeev.myapplication.myactivity.oncreate(myactivity.java:23)         @ android.app.activity.performcreate(activity.java:5720)         @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1102)         @ android.app.activitythread.performlaunchactivity(activitythread.java:2208) 

what cause error?

 

use animation set in code, that:

public void onresume(){     super.onresume();     textview.startanimation(animationutils.loadanimation(getactivity(), r.anim.slide_up)); }