# E015 — Worktree materialization conflict (https://jackin.tailrocks.com/reference/errors/E015/)



**E015**: Worktree materialization conflict

## What to try [#what-to-try]

Run `jackin prune isolation` to clean up stale worktree state, then re-run the launch.

## See also [#see-also]

* Run `jackin doctor` for a full pre-flight health check.
* Pass `--debug` to any `jackin` command to enable diagnostic tracing.