problem in compiling project in GWT

Hi I have started to do the GWT tutorials:
https://developers.google.com/web-toolkit/doc/latest/tutorial/index

I have finished all the mission up to "compiling your project", using eclipse and I have reach the "Step 8: Compiling a GWT Application"

I compile the project, the output in the eclipse look OK, but when I try to run all I see is "This html file is for Development Mode support", when I run the host.html file.

Where am I wrong?

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