# src.BuildError.SessionExists

- **Module:** src.BuildError
- **Package:** tmux-workspace
- **Language:** Rust
- **Kind:** constant
- **Source:** https://github.com/libtmux/libtmux-rs/blob/f0e37052c232636b61d095817046e6bfc8f2ca40/crates/tmux-workspace/src/lib.rs#L84
- **Page:** https://libtmux.org/en/rs/latest/workspace/reference/src-builderror-sessionexists/

A session with the requested name already exists.

Building into an existing session would interleave windows with
whatever is already there, so it is refused rather than guessed at.