---
title: Error Information
framework: contacts
role: collectionGroup
role_heading: API Collection
path: contacts/error-information
---

# Error Information

Diagnose errors generated by the Contacts framework.

## Topics

### Error domain

- [CNErrorDomain](contacts/cnerrordomain.md)

### Error codes

- [CNError](contacts/cnerror.md)
- [CNError.Code](contacts/cnerror/code.md)

### Error data keys

- [CNErrorUserInfoAffectedRecordsKey](contacts/cnerroruserinfoaffectedrecordskey.md)
- [CNErrorUserInfoAffectedRecordIdentifiersKey](contacts/cnerroruserinfoaffectedrecordidentifierskey.md)
- [CNErrorUserInfoValidationErrorsKey](contacts/cnerroruserinfovalidationerrorskey.md)
- [CNErrorUserInfoKeyPathsKey](contacts/cnerroruserinfokeypathskey.md)

### Exceptions

- [CNContactPropertyNotFetchedExceptionName](contacts/cncontactpropertynotfetchedexceptionname.md)