# tmux.FailUnsupported

- **Module:** tmux
- **Package:** github.com/libtmux/libtmux-go/tmux
- **Language:** Go
- **Kind:** constant
- **Source:** https://github.com/libtmux/libtmux-go/blob/5f808882015a975a65acc7f9da5b3ff0d5cbdc91/tmux/warning.go#L32
- **Page:** https://libtmux.org/reference/go/tmux-failunsupported/

FailUnsupported refuses a request naming a capability the running tmux does not have, with a VersionTooLowError naming the subcommand and the capability. It is the zero value.