Enum describing possible field 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 required field was not present. | 
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                The field attempted to be mutated is immutable. | 
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                The field's value is invalid. | 
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                The field cannot be set. | 
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                The required repeated field was empty. | 
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                The field cannot be cleared. | 
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                The field's value is on a deny-list for this field. | 
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                The field's value cannot be modified, except for clearing. |