Error Code Portal
MicrosoftWindows Win32Error code

1280

ERROR_ALREADY_FIBER

Alternative forms: 0x00000500 · 0x500 · ERROR_ALREADY_FIBER · 0x80070500

What does this code mean?

Code 1280 · An issue reported by Windows Win32.

Official explanation · Original text

The current thread has already been converted to a fiber.

Troubleshooting and diagnostic links

First check that the document's product, version, and environment match your situation.

Source and terms of use

System Error Codes (1000-1299) (WinError.h) ↗

Creator: Microsoft and MicrosoftDocs contributors
License: Creative Commons Attribution 4.0 International
Checked on: 2026-11-12

Modifications: Extracted numeric codes, symbolic names and English message text; converted Markdown/HTML to plain text and normalized whitespace; added Korean product context, namespace labels, status classification and separately labeled official links. No machine translation of message text.

Source details · Original licenses and notices