[Building Sakai] Beginner of Sakai

[Sam Chow]

Dear All,

I am a beginner of devloping Sakai. I try to add atools with Eclipses's Sakai App Builder. I can successful deploy the tools if i choose Hello World app under implementations, but it is fail to deploy if i choosse Full CRUD app with this following error: Unable to download the artifact from any repository : org.sakaiproject:master:pom:2.7.0-SNAPSHOT.

Any one have idea on this issue? 
Many Thanks.

Best Regards,
Sam Chow
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