---
title: kSecTransformPreviousErrorKey
framework: security
role: symbol
role_heading: Global Variable
path: security/ksectransformpreviouserrorkey
---

# kSecTransformPreviousErrorKey

The key in an error’s userInfo dictionary whose value specifies the previous error when multiple errors occur during transform evaluation.

## Declaration

```swift
let kSecTransformPreviousErrorKey: CFString
```

## Discussion

Discussion Use the value associated with this key to trace through a chain of CFError objects when more than one error occurs during transform evaluation.