https://uberchromegw.corp.google.com/i/chromium.perf/builders/Win%207%20Perf%20(3)

Logs of failed builds contain little information:

Traceback (most recent call last):
  File "C:\b\build\slave\Win_7_Perf__3_\build\src\testing\scripts\gtest_perf_test.py", line 81, in <module>
    sys.exit(common.run_script(sys.argv[1:], funcs))
  File "C:\b\build\slave\Win_7_Perf__3_\build\src\testing\scripts\common.py", line 59, in run_script
    return args.func(args)
  File "C:\b\build\slave\Win_7_Perf__3_\build\src\testing\scripts\gtest_perf_test.py", line 56, in main_run
    rc = common.run_runtest(args, gtest_args + filter_tests)
  File "C:\b\build\slave\Win_7_Perf__3_\build\src\testing\scripts\common.py", line 80, in run_runtest
    cmd_args.paths['runit.py'],
KeyError: 'runit.py'

Not sure what the "KeyError" is, a cause or effect?