# os.ErrExist

- **ID:** `go/os-errexist`
- **Domain:** go
- **Category:** system_error
- **Verification:** official
- **Fix Rate:** 80%

## Root Cause

File or directory already exists. os.Mkdir() or os.Create() called on an existing path.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 1.x | active | — | — |