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# NSNetServices Errors

If an error occurs, the delegate error-handling methods return a dictionary with the following keys.

## Topics

### Constants

[`class let errorCode: String`](/documentation/Foundation/NetService/errorCode-swift.type.property)

This key identifies the error that occurred during the most recent operation.

[`class let errorDomain: String`](/documentation/Foundation/NetService/errorDomain)

This key identifies the originator of the error, which is either the `NSNetService` object or the mach network layer. For most errors, you should not need the value provided by this key.


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