please clear cache of your browser and delete all the output dirs for
modules (that named after your module found under "war" folder)

On 17 Nov., 07:16, Hendrik Jan van Randen <[email protected]>
wrote:
> We're migrating our GWT 2.0.4 application to GWT 2.1.0.
> I've therefore upgraded my Google Plugin for Eclipse to GWT 2.1.0.
>
> When I try to run our application in the GWT debugger in Eclipse
> (Debug as web application, go to its URL in Firefox) I get the
> following message:
>
> Connection received from localhost:47526
>    [ERROR] Invalid version number "2.0" passed to
> external.gwtOnLoad(), expected "2.1"; your hosted mode bootstrap file
> may be out of date; if you are using -noserver try recompiling and
> redeploying your app
>
> Recompiling doesn't resolve the problem.
> Also changing the version from 2.0 to 2.1 in the line
> var $hostedHtmlVersion="2.1";
> in the files hosted.html in the war directory doesn't resolve the
> problem.
> I cannot find any explicit instructions to migrate from GWT 2.0 to
> 2.1.
>
> My environment:
> Ubuntu 10.04 LTS
> Firefox 3.6.12 with Google Web Toolkit Developer Plugin for Firefox
> 1.0.7511
> Eclipse Helios with Google Plugin for Eclipse with GWT version 2.1.0.
>
> Any suggestions how I can resolve this problem?

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