Getting NoSuchMethodError with TextView Methods

I am getting an `NoSuchMethodError` with a class that I made that extends the `TextView`. The only thing I did was adding it some variables and adding `onLongClickListener`. No more modifications. Everything is working fine when I use my application in my android phone 4.1.2 But in my friend's phone which is 4.0.3, it throws this `NoSuchMethodError`. Here is the code when i create the Class that extends the Textview: ``` descrip=new TextViewList(context, admin, this); descrip.setPadding(0, 15, 0, 15); descrip.setGravity(Gravity.CENTER); descrip.setTextAlignment(Gravity.CENTER); descrip.setText(c.getString(c.getColumnIndex("Descripcion"))); descrip.setTag(c.getString(c.getColumnIndex("ID"))); descrip.setWidth(LinearLayout.LayoutParams.MATCH_PARENT); descrip.setHeight(LinearLayout.LayoutParams.MATCH_PARENT); descrip.setBackground(img); layDescripcion.addView(descrip); ``` First it threw the exception with `setTextAlignment`, then I removed it and threw it again with the `setBackground` method. What is causing this error? Does that mean that my app isn't compatible with Android versions below 4.1.2? I set the minimun to be 2.2 when I created the project. And I am using android.support.v4 libraries where they are requested. Here is the LogCat: ``` 07-09 21:45:26.715: E/AndroidRuntime(13481): FATAL EXCEPTION: main 07-09 21:45:26.715: E/AndroidRuntime(13481): java.lang.NoSuchMethodError: modelo.TextViewList.setBackground 07-09 21:45:26.715: E/AndroidRuntime(13481): at modelo.ListaTextViewList.mostrarGastos(ListaTextViewList.java:92) 07-09 21:45:26.715: E/AndroidRuntime(13481): at controlador.AdminUI.establecerListaGastoVar(AdminUI.java:138) 07-09 21:45:26.715: E/AndroidRuntime(13481): at com.ConApps.walletsaver.GastosVariables.onCreate(GastosVariables.java:23) 07-09 21:45:26.715: E/AndroidRuntime(13481): at android.app.Activity.performCreate(Activity.java:4465) 07-09 21:45:26.715: E/AndroidRuntime(13481): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1052) 07-09 21:45:26.715: E/AndroidRuntime(13481): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1932) 07-09 21:45:26.715: E/AndroidRuntime(13481): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1993) 07-09 21:45:26.715: E/AndroidRuntime(13481): at android.app.ActivityThread.access$600(ActivityThread.java:127) 07-09 21:45:26.715: E/AndroidRuntime(13481): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1159) 07-09 21:45:26.715: E/AndroidRuntime(13481): at android.os.Handler.dispatchMessage(Handler.java:99) 07-09 21:45:26.715: E/AndroidRuntime(13481): at android.os.Looper.loop(Looper.java:137) 07-09 21:45:26.715: E/AndroidRuntime(13481): at android.app.ActivityThread.main(ActivityThread.java:4507) 07-09 21:45:26.715: E/AndroidRuntime(13481): at java.lang.reflect.Method.invokeNative(Native Method) 07-09 21:45:26.715: E/AndroidRuntime(13481): at java.lang.reflect.Method.invoke(Method.java:511) 07-09 21:45:26.715: E/AndroidRuntime(13481): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790) 07-09 21:45:26.715: E/AndroidRuntime(13481): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557) 07-09 21:45:26.715: E/AndroidRuntime(13481): at dalvik.system.NativeStart.main(Native Method) ```