gwt-material: Navbar problem

I can’t make the MaterialNavBar example work (https://gwtmaterialdesign.github.io/gwt-material-demo/#navbar).

I’m getting the “cannot read property ‘displayEffect’ of undefined” error while trying to use material navbar.

The code i used is copied from here: https://gwtmaterialdesign.github.io/gwt-material-demo/#navbar

<g:HTMLPanel> <m:MaterialHeader> <m:MaterialNavBar> <m:MaterialNavBrand href="#Test" float="LEFT" text="App Title"/> <m:MaterialNavSection float="RIGHT"> <m:MaterialLink iconType="ACCOUNT_CIRCLE" iconPosition="LEFT" text="Account" textColor="WHITE" waves="LIGHT"/> <m:MaterialLink iconType="AUTORENEW" iconPosition="LEFT" text="Refresh" textColor="WHITE" waves="LIGHT"/> <m:MaterialTooltip text="Menu"> <m:MaterialLink iconType="SEARCH" textColor="WHITE" waves="LIGHT"/> </m:MaterialTooltip> <m:MaterialTooltip text="Starter"> <m:MaterialLink iconType="MORE_VERT" textColor="WHITE" waves="LIGHT"/> </m:MaterialTooltip> </m:MaterialNavSection> </m:MaterialNavBar> </m:MaterialHeader> </g:HTMLPanel>

Saw somewhere that: “The navbar is intended to be hidden on FLoat types” but i dont know how to do it