# X_BENCH_URL_REQUIRED

## Means

the restart benchmark's client shard was started without `--url`

## Typical cause

the shard has no endpoint to connect its clients to, and the orchestrator had already spawned it — a bare `Error` said nothing a `--json` reader could act on

## Fix

`bun run scripts/bench/restart-bench-client-worker.ts --url <ws-url> --count <n> --offset <n>`

[CLI and verify](/error-codes#cli-and-verify)