buildbot failure in on attic-site

[buildbot]

The Buildbot has detected a new failure on builder attic-site while building . 
Full details are available at:
    https://ci.apache.org/builders/attic-site/builds/123

Buildbot URL: https://ci.apache.org/

Buildslave for this Build: bb_slave1_ubuntu

Build Reason: The AnyBranchScheduler scheduler named 'on-attic-site-commit' 
triggered this build
Build Source Stamp: [branch attic/site] 1855038
Blamelist: sebb

BUILD FAILED: failed shell_4

Sincerely,
 -The Buildbot