No resource identifier found for attribute 'met_floatingLabel'

[xbandx68]

I have iserted in my grandle this
compile ('com.weiwangcn.betterspinner:library-material:1.1.0') {
exclude group: 'com.android.support', module: 'appcompat-v7'
exclude group: 'com.rengwuxian.materialedittext', module: 'library'
}

and
in my layout this:

...
...
...
<com.weiwangcn.betterspinner.library.material.MaterialBetterSpinner
android:id="@+id/spinner2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="MaterialBetterSpinner"
app:met_floatingLabel="normal" />

but the compiler report me:

Error:(43) No resource identifier found for attribute 'met_floatingLabel' in package 'com.bandweb.myviewrecipes'

why?

[Lesilva]

If you don't have MaterialEditText in your own project, do not exclude it.