Maven project - server error 500 for me but works fine for someone else?

You must have configured a Maven proxy somewhere, with name s1.semanticscience.org:8080/nexus.

Seems like the Nexus server replied with an error 500 when Maven tried to retrieve gxt-2.2.5 from there. I would just try again and if it still doesn't work, check the URL in your browser and maybe speak to the admin(s) of that Nexus installation.

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