I have (along with others) hit this error here when we don't have a local mach build, or if the build needs to be rebuilt:

functools.partial(<function MachCommandConditions.is_buildapp_in at 0x1021acca0>, apps=['firefox', 'android']) - partial(func, *args, **keywords) - new function with partial application of the given arguments and keywords.

It would be good to clarify this.

Furthermore, this error also occurs when we try testing with an android build that is non-local through a command like:
./mach perftest --flavor mobile-browser --android --android-app-name org.mozilla.fennec_aurora --android-activity org.mozilla.fenix.IntentReceiverActivity --android-clear-logcat --android-capture-logcat logcat --android-perf-tuning --perfherder-metrics processLaunchToNavStart --android-install-apk fenix_nightlysim_multicommit_armeabi_v7a --hooks testing/performance/hooks_applink.py --perfherder --perfherder-app fenix --browsertime-geckodriver geckodriver --browsertime-iterations 14 --test-date 2020.07.14 testing/performance/perftest_applink.js

The severity field is not set for this bug.
:tarek, could you have a look please?

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:sparky, since the bug has high priority and high severity, could you have a look please?

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