# tmux.ErrVersionCheckFailed

- **Module:** tmux
- **Package:** github.com/libtmux/libtmux-go/tmux
- **Language:** Go
- **Kind:** attribute
- **Source:** https://github.com/libtmux/libtmux-go/blob/2de249b600d65218ee8b8fdc07c6b2b919242151/tmux/version_check.go#L104
- **Page:** https://libtmux.org/en/go/latest/reference/tmux-errversioncheckfailed/

ErrVersionCheckFailed identifies a failure of the check that precedes every ordinary command, a refusal included: an ErrVersionTooLow from Cmd matches it too. The check is a read-only probe, so a command that fails with it was never sent, whatever else the error matches.