buildbot exception in MacPorts on ports-10.12_x86_64-builder

[buildbot at macports.org]

The Buildbot has detected a build exception on builder ports-10.12_x86_64-builder while building macports/macports-ports. Full details are available at:
    https://build.macports.org/builders/ports-10.12_x86_64-builder/builds/58170

Buildbot URL: https://build.macports.org/

Buildslave for this Build: ports-10.12_x86_64

Build Reason: The Triggerable scheduler named 'ports-10.12_x86_64-trigger' triggered this build
Build Source Stamp: [branch master] 76c3b45d27eb9f8a7a4c178d3ba9e3b642cda5ae
Blamelist: Mojca Miklavec <mojca at macports.org>

BUILD FAILED: exception upload cleanup

Sincerely,
 -The Buildbot