android - When I add the facebook login button in the xml, it said missing style -


i trying add facebook login button xml. unfortunaltely, ui page show me error message is

"missing styles.is correct theme chosen layout?"

how can fix error?

thanks.

<com.facebook.login.widget.loginbutton     android:id="@+id/login_button"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_gravity="center_horizontal"     android:layout_margintop="30dp"     android:layout_marginbottom="30dp" />


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