importing spring project problem

Im having touble importing a spring project in eclipse ide
it works fine after importing it but after a few seconds the project structure changes radically and the content of the source folder gets sucked out of it (picture)
Is this something I have to worry about?
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When trying to run the application I also get this error which I dont understand

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“Some dependencies are not installed” the tutorial I followed didnt install anything they just created the Spring Project and imported it!

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Are you behind a proxy?

not to my knowledge

Hi!
Try to run mvn vaadin:clean-frontend and then a mvn clean package before you run your app. Maybe trying this will help you…