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Editorial Team
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Asked: 2026-05-23T08:40:22+00:00

I already solved this question, this Q&A is purely for future Googlers since it

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I already solved this question, this Q&A is purely for future Googlers since it was extremely difficult for me to find the solution via Google – but thanks for looking

I changed my project to GWT 2.3.0 but then had to change back to 2.0.3 (in Eclipse) and now when I run it and try to view it in my browser, I get the following error:

[ERROR] Invalid version number “2.1” passed to external.gwtOnLoad(), expected “2.0”; your hosted mode bootstrap file may be out of date; if you are using -noserver try recompiling and redeploying your app

I’ve tried cleaning and rebuilding and that doesn’t work. How do I fix it?

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1 Answer

  1. Editorial Team

    Inside your war directory you should have a folder named after your module. Stop debugging if it’s running, then delete that module folder (not the entire war folder). Run again; the module folder will be recreated and the error will no longer occur.

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