When compiled in pretty or detailed mode you could look at the mentioned line and character in your js file. Alternatively you could try to enable emulated stack traces in GWT. Maybe you get more information then.--
Also make sure your have a <!DOCTYPE html> in your html page so you are not in quirks mode.
The error you have posted doesn't contain any information that can help other people to guess the problem. Without more information you are on your own.
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