[Error Actionability] Improve Omegaconf config error when root type is None #1214
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Motivation
Improve the error message for the above scenario to indicates which field leads to exception.
If parent config is None, we can not set child column.
Example:
the error message was
Unexpected type for root: NoneType
. with this PR the error message becomesUnexpected type for root: NoneType. We cannot set 'smc_tier' to 'test_hydra' when root is None. Please make sure the config value of ['checkpoint_eval', 'smc_tier'] is valid.
Test Plan
Internal testing at Meta