Enum describing possible label 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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                An inactive label cannot be applied. | 
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                A label cannot be applied to a disabled ad group criterion. | 
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                A label cannot be applied to a negative ad group criterion. | 
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                Cannot apply more than 50 labels per resource. | 
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                Labels from a manager account cannot be applied to campaign, ad group, ad group ad, or ad group criterion resources. | 
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                Label names must be unique. | 
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                Label names cannot be empty. | 
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                Labels cannot be applied to a draft. | 
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                Labels not from a manager account cannot be applied to the customer resource. |