Error In Upgrade My Project to Gwt2.2

Hi I was Using Gwt2.0.3
To develop Some Application On Eclipse By
new > Project > Dynamic Web Project
and on the Project (right click > google web toolkit > Convert Project
Into GWT Project )

And Then i want To Upgrade To GWT2.2 I Download the New Plug in Of
the Eclipse And Put The Libs On It And Try To run The Application But
I found this error

00:00:04.750 [TRACE] Connection received from localhost:3061..
00:00:04.750 [ERROR] Invalid version number "2.0" passed to
external.gwtOnLoad(), expected "2.1"; your development mode bootstrap
file may be out of date; if you are using -noserver try recompiling
and redeploying your app; if you just switched to a different version
of GWT, try clearing your browser cache

So I want To find Any Way To Convert This project To Gwt2.2

thnx

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