Can somebody explain what happened here?

Okay, can somebody please explain to me what just happened...

I tore down everything I wrote today, checked out different versions of my project, cleaned it multiple times, restarted the code server, tomcat and even Eclipse and after everything even my machine.. 

I started to get this error: http://pastebin.com/J69T553R

But it did not break everything at once. Just slowly step by step I could not navigate and more and more pages led to this exception. After going crazy I decided to create a new simple HomeView/Presenter/etc to try and test what the heck was wrong. Unfortunately this did not work and after this little test anything else went down the same and stopped working. 

I have no idea why I thought about this but after hours of ripping hair off my head I did this:

<!DOCTYPE ui:UiBinder SYSTEM "http://dl.google.com/gwt/DTD/xhtml.ent">

<ui:UiBinder xmlns:ui="urn:ui:com.google.gwt.uibinder"

xmlns:g="urn:import:com.google.gwt.user.client.ui">

<ui:style>

</ui:style>

<g:HTMLPanel>

   asd

</g:HTMLPanel>

</ui:UiBinder> 

to

<!DOCTYPE ui:UiBinder SYSTEM "http://dl.google.com/gwt/DTD/xhtml.ent">

<ui:UiBinder xmlns:ui="urn:ui:com.google.gwt.uibinder"

xmlns:g="urn:import:com.google.gwt.user.client.ui">

<ui:style gss="true">

</ui:style>

<g:HTMLPanel>

   asd

</g:HTMLPanel>

</ui:UiBinder>  

 and everything was back to normal. Usually I would not care but this just made me almost throw stuff against my monitors thus I'd really like to know what just happened ... I am not even sure if that did the trick but right after adding gss="true" it started working again. I can even remove it now and it's still working.. 

Thanks for any clarification!

BR; Stefan

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