Error: GWT developer plugin for chrome

I am using Eclipse Mars fro Java EE. I have added GWT, Java machine 1.7, and tried my first application.

Error: I have add the localhost server in both GWT Eclipse plugin and Chrome, but it results when I click RUN the projetc it open Chrome (already with GWT developer plugin and restarted) but the page just show me a message that say I need to download the Chrome Developer  plugin, once and again the same.

I have configured the Chrome plugin letting localhost and 127.0.0.1. I have copy the http address gives the Eclipse and paste to the browser instead open from the Eclipse, and always the Chrome ask for this plugin agin, when it is installed and configured.

Any idea, someone getting the same ?  How-to debug and test in a browser the project ?

Thank you.

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