---
title: MARKLESS_SHARED_SEED_UNSUPPORTED
description: "Cannot seed shared state from this expression: a Markless compiler error."
sidebar: { hidden: true }
search: { keywords: ["SHARED_SEED_UNSUPPORTED","shared seed unsupported","markless error"] }
pagination: false
---

**Error** from the compiler, while it builds your `.tsrx` files.

## What happened

Markless prints the message, the reason, and a suggestion:

```text
MARKLESS_SHARED_SEED_UNSUPPORTED: Cannot seed "<target>" from "<target>" because a component body seeds a shared instance only from its own props or from constants.
A component body runs once during initial render. The compiler turns a shared-state assignment there into a per-instance initial value, which it can only build from values the render already has: this component's props and constants.
Assign a prop or a constant, or move the write into an event handler where the shared instance is already live.
https://markless.dev/errors/MARKLESS_SHARED_SEED_UNSUPPORTED
```

Words in angle brackets change from case to case.

## How to fix it

Start with the suggestion in the message above.

This page has no guide yet. [Help write it](/contributing/improve-these-docs).

## Where it comes from

`@markless/compiler` raises this code. Source:

- [packages/compiler/src/passes/state-lowering.ts](https://github.com/compiled-run/markless/blob/main/packages/compiler/src/passes/state-lowering.ts)

Read [how to read a Markless error](/tooling/diagnostics), or go back to [all error codes](/errors).