Error on execution (correct)

Hi!
I'm still trying to build my project, and after several searches, i found a really nice project, and i will use it to build my system. After the adjustments, the system show this error message:
"GWT module "br.com.site.sistema.Main" may need to be (re)compiled".
How i solve this? :S

Thanks for all! :D

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Diego Venuzka

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