Compiling GWT to single JS file

Hi,

I want to run my GWT module as desktop application using xulrunner, and I need to compile it in a single JS file and then embed it in html page. I'm compiling with 

<set-property name="user.agent" value="gecko1_8"/>

<add-linker name="sso"/>

But I get 

[ERROR] The module must have exactly one distinct permutation when using the Single Script Linker; found 0

My GWT application is too simply, just added a text field.

In firebug I see single JS file, but page shows nothing.

What did I do wrong? Are there another way to do it?

Thanks:)

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