Почему может не работать ресайклер ?

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/refresher"
android:layout_width="match_parent"
android:layout_height="match_parent">

<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">

<android.support.v7.widget.RecyclerView
android:id="@+id/recycler"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:visibility="visible"/>

<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/et_comments"/>

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:id="@+id/btn_comments"
android:text="@string/comments"/>
</LinearLayout>

<include
layout="@layout/error_view"
android:visibility="gone" />

</FrameLayout>
</android.support.v4.widget.SwipeRefreshLayout>

что конкретно не работает? Зачем верстка-то?