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It seems there's a problem with your local copy of this JARs. Can you try deleting them from your .m2/repository? Maven should then re-download them. The tutorial builds fine for me.
OK, thanks. It worked. I deleted all the ".M2/repository/*.*" files. I'm new to Maven, is it a common problem? I hope I'll will not need to do that often.
Thanks for your work on Errai, as far as I got it's an impressive framework.