what should I do with

I want to make the GWT compiled js as one single js so I can delay
loading after the page load
(via a var s = createElement("script"); s.src="my.js";
document.body.appendChild(s); )

Looks like I should use sso linker, so I add the following line to

<add-linker name="sso" />

to the MyModule.gwt.xml file to ask the GWT to compile into only one
js

but now I always get the following error
"
Bookstrap link for command-line module ...
Linking module ...
invoking Liker Single Script
The module must have exactly one distinct permutation when using the
Single Script Linker
"

I assume the "permutation" mean the generated js for one kind of
browser. How can I set the flag in GWT configuration to ask it to only
have only one distinct permutation so this linker will work?

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