Enum describing possible field mask errors.
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                Enum unspecified. | 
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                The received error code is not known in this version. | 
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                The field mask must be provided for update operations. | 
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                The field mask must be empty for create and remove operations. | 
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                The field mask contained an invalid field. | 
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                The field mask updated a field with subfields. Fields with subfields may be cleared, but not updated. To fix this, the field mask should select all the subfields of the invalid field. |