AttributeError: 'Automation' object has no attribute 'DEFAULT_APP'

[kkuehl]

$ python ./domfuzz/dom/automation/loopdomfuzz.py --submit ~/build
Loading bool prefs

%%% 2018-06-06 11:04:19.177889 starting q1: file:/home/kkuehl/build/tests/reftest/tests/layout/reftests/svg/filter-in-mask-01.svg#fuzz=2353172488,0,125,0,30000,0
detect_assertions is ready (ignoring 470 strings without filenames and 1392 strings with filenames)
reftestScriptDir /home/kkuehl/build/tests/reftest
Traceback (most recent call last):
  File "/home/kkuehl/Downloads/github/domfuzz/dom/automation/runbrowser.py", line 138, in <module>
    runBrowser()
  File "/home/kkuehl/Downloads/github/domfuzz/dom/automation/runbrowser.py", line 63, in runBrowser
    theapp = os.path.join(reftestScriptDir, automation.DEFAULT_APP)
AttributeError: 'Automation' object has no attribute 'DEFAULT_APP'
DOMFUZZ INFO | domInteresting.py | Terminated by signal 9000 (unknown signal)
Traceback (most recent call last):
  File "./domfuzz/dom/automation/loopdomfuzz.py", line 294, in <module>
    start_runs()
  File "./domfuzz/dom/automation/loopdomfuzz.py", line 281, in start_runs
    many_timed_runs(None, sps.createWtmpDir(os.getcwdu()), sys.argv[1:], collector, quiet=False)
  File "./domfuzz/dom/automation/loopdomfuzz.py", line 91, in many_timed_runs
    result = domInteresting.BrowserResult(bc, url, logPrefix, extraPrefs=extraPrefs, quiet=quiet)
  File "/home/kkuehl/Downloads/github/domfuzz/dom/automation/domInteresting.py", line 656, in __init__
    assert alh.theapp
AssertionError