buildbot exception in on cayenne-nightly

[buildbot]

The Buildbot has detected a build exception on builder cayenne-nightly while 
building . Full details are available at:
    https://ci.apache.org/builders/cayenne-nightly/builds/1799

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

Buildslave for this Build: asf947_ubuntu

Build Reason: The Nightly scheduler named 'cayenneNightly' triggered this build
Build Source Stamp: [branch cayenne/main/trunk/] HEAD
Blamelist: 

BUILD FAILED: exception compile MasterShellCommand_1 MasterShellCommand_3

Sincerely,
 -The Buildbot