# Bug 3488: Error: "single output already exists" in hello-zero-solid

- Status: closed
- Project: Zero
- Creator: @aboodman
- Assignee: @grgbkr
- Created: 2025-01-30T08:30:11Z
- Modified: 2025-02-02T01:36:06Z
- URL: https://bugs.rocicorp.dev/p/zero/issue/3488

## Description

See https://discord.com/channels/830183651022471199/1334436176710336543

I temporarily worked around this by adding `q => q.one()` in the relevant queries in the sample. When this is fixed, undo that change in the sample.

## Comments (0)