"Element EditText is not allowed here" inside a TextInputLayout

Try using android.support.v7.widget.AppCompatEditText instead of EditText:

 <android.support.design.widget.TextInputLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content">

    <android.support.v7.widget.AppCompatEditText
        android:id="@+id/email"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:ems="10"
        android:hint="@string/email"
        android:inputType="textEmailAddress" />
</android.support.design.widget.TextInputLayout>

I had the same issue and this did the job for me.

Try changing to these versions. It worked for me.

compileSdkVersion 22
    buildToolsVersion "22.0.1"

and

targetSdkVersion 22