buildbot failure in on jena-site-staging

[buildbot]

The Buildbot has detected a new failure on builder jena-site-staging while 
building . Full details are available at:
    https://ci.apache.org/builders/jena-site-staging/builds/199

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

Buildslave for this Build: bb-cms-slave

Build Reason: The AnyBranchScheduler scheduler named 'on-jena-site-commit' 
triggered this build
Build Source Stamp: [branch jena/site] 1794376
Blamelist: ajs6f

BUILD FAILED: failed compile

Sincerely,
 -The Buildbot