Enum describing possible mutate 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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                Requested resource was not found. | 
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                Cannot mutate the same resource twice in one request. | 
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                The field's contents don't match another field that represents the same data. | 
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                Mutates are not allowed for the requested resource. | 
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                The resource isn't in Google Ads. It belongs to another ads system. | 
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                The resource being created already exists. | 
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                This resource cannot be used with "validate_only". | 
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                This operation cannot be used with "partial_failure". | 
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                Attempt to write to read-only fields. |