Gearset may surface this Salesforce validation error when you've included Global Value Set metadata type in your metadata filter and, for example, you may be trying to deploy a picklist between two environments (e.g. Salesforce orgs).

This error type, Duplicate label <xxx> where <xxx> references a specific label name, is likely to occur during deployments when attempting to modify Global Picklist Value Sets by changing the API names of picklist values.
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An example of the error in our app would look as below:

According to Salesforce documentation, you should consider this to be expected behavior.
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When you deploy changes to picklist values via Metadata API, Salesforce looks at the picklist name as its unique identifier.

If you change the API name of a given picklist value (in your source environment), Salesforce will understand it as an attempt to create a new picklist value with a duplicate label (in the target org).
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And because Salesforce recognizes that there is already a (picklist) value in the target org with the same label - the deployment attempt results in the above error.
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​So what should I do instead?
If you attempt to change only the picklist value's label, Salesforce will recognize the value based on its API name and successfully deploy the change to your target org.
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For more information on this error, please refer to:
​Salesforce Knowledge Articles