Freshly created Spoofax project fails to build

Failed to read Maven project: 1 problem was encountered while building the effective model for org.metaborg.atb:atb:0.1.0-SNAPSHOT
[FATAL] Non-resolvable parent POM for org.metaborg.atb:atb:0.1.0-SNAPSHOT: Failure to find org.metaborg:parent.language:pom:2.0.0-SNAPSHOT in http://artifacts.metaborg.org/content/repositories/core-snapshots/ was cached in the local repository, resolution will not be reattempted until the update interval of metaborg-snapshot-repo has elapsed or updates are forced and ‘parent.relativePath’ points at wrong local POM @ line 13, column 11
for project org.metaborg.atb:atb:0.1.0-SNAPSHOT at /Users/eelcovisser/Dropbox/06-Program/workspace-spoofax/atb/pom.xml

Submitted by Eelco Visser on 18 May 2016 at 08:57

This was probably caused by (first) building project when maven repository was down.