---
title: kIOUSBUnknownPipeErr
framework: IOKit
role: symbol
role_heading: Macro
platforms: [Mac Catalyst 13.0+, macOS 10.0+]
path: iokit/kiousbunknownpipeerr
---

# kIOUSBUnknownPipeErr

## Declaration

```occ
#define kIOUSBUnknownPipeErr
```

## Discussion

Discussion Errors specific to the IOUSBFamily. Note that the iokit_usb_err(x) translates to 0xe0004xxx, where xxx is the value in parenthesis as a hex number.