falco-full-compile-paladin board can't start due to error:

@@@STEP_LOG_LINE@exception@LookupError: Failed to get the master config; running ['/usr/bin/python', '/b/build/scripts/tools/dump_master_cfg.py', '/b/build_internal/masters/master.chromeos', '/b/build/slave/falco-full-compile-paladin-master/.recipe_runtime/tmpd5KLhB/dump_master_cfg.json'] in '/b/build' returned exit code 1@@@

@@@STEP_LOG_LINE@exception@stdout: @@@

@@@STEP_LOG_LINE@exception@stderr: error while parsing /b/build_internal/masters/master.chromeos/master.cfg: @@@

@@@STEP_LOG_LINE@exception@Traceback (most recent call last):@@@

@@@STEP_LOG_LINE@exception@  File "/b/build/scripts/common/master_cfg_utils.py", line 105, in LoadConfig@@@

@@@STEP_LOG_LINE@exception@    localdict = ExecuteConfig(canonical_config)@@@

@@@STEP_LOG_LINE@exception@  File "/b/build/scripts/common/master_cfg_utils.py", line 80, in ExecuteConfig@@@

@@@STEP_LOG_LINE@exception@    exec f in localDict@@@

@@@STEP_LOG_LINE@exception@  File "/b/build_internal/masters/master.chromeos/master.cfg", line 30, in <module>@@@

@@@STEP_LOG_LINE@exception@    from master import master_utils@@@

@@@STEP_LOG_LINE@exception@  File "/b/build/scripts/master/master_utils.py", line 24, in <module>@@@

@@@STEP_LOG_LINE@exception@    from buildbot.status.web.baseweb import WebStatus@@@

@@@STEP_LOG_LINE@exception@  File "/b/build/third_party/buildbot_8_4p1/buildbot/status/web/baseweb.py", line 46, in <module>@@@

@@@STEP_LOG_LINE@exception@    from infra_libs.ts_mon.common import http_metrics@@@

@@@STEP_LOG_LINE@exception@ImportError: No module named infra_libs.ts_mon.common@@@

@@@STEP_LOG_LINE@exception@Traceback (most recent call last):@@@

@@@STEP_LOG_LINE@exception@  File "/b/build/scripts/tools/dump_master_cfg.py", line 55, in <module>@@@

@@@STEP_LOG_LINE@exception@    sys.exit(main(sys.argv[1:]))@@@

@@@STEP_LOG_LINE@exception@  File "/b/build/scripts/tools/dump_master_cfg.py", line 47, in main@@@

@@@STEP_LOG_LINE@exception@    json.dump(result['BuildmasterConfig'],@@@

@@@STEP_LOG_LINE@exception@TypeError: 'NoneType' object has no attribute '__getitem__'@@@

The effected build is:

https://uberchromegw.corp.google.com/i/chromeos/builders/falco-full-compile-paladin/builds/6729
https://uberchromegw.corp.google.com/i/chromeos/builders/falco-full-compile-paladin/builds/6728
https://uberchromegw.corp.google.com/i/chromeos/builders/falco-full-compile-paladin/builds/6727