# libtmux::CommandRuntimeShutdown::failure

- **Module:** libtmux::CommandRuntimeShutdown
- **Package:** libtmux-cxx
- **Language:** C++
- **Kind:** attribute
- **Source:** https://github.com/libtmux/libtmux-cxx/blob/393d4b0ad666f18a6581f1eb281741a75a7503f0/include/libtmux/async.hpp#L71
- **Page:** https://libtmux.org/en/cxx/latest/reference/libtmux-commandruntimeshutdown-failure/

The first runtime lifecycle failure; an operation may also carry it.