Specified SDKMACHINE value is not valid


NEWBIE question!
I tried building and I get: "Specified SDKMACHINE value is not valid"

pi@raspberrypi ~/p/build> bitbake core-image-minimal
/usr/lib/python3/dist-packages/html5lib/_trie/_base.py:3: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated, and in 3.8 it will stop working
  from collections import Mapping
WARNING: Host distribution "raspbian-10" has not been validated with this version of the build system; you may possibly experience unexpected failures. It is recommended that you use a tested distribution.
ERROR:  OE-core's config sanity checker detected a potential misconfiguration.
    Either fix the cause of this error or at your own risk disable the checker (see sanity.conf).
    Following is the list of potential problems / advisories:
    Specified SDKMACHINE value is not valid
Summary: There was 1 WARNING message shown.
Summary: There was 1 ERROR message shown, returning a non-zero exit code.

I've tried setting SDKMACHINE to 'arm' and 'qemuarm' but get the same message?

Obviously I failed to do something (properly)?


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