I Need to Connect to Local Parachain .

I did step by step every thing in this page : Substrate

in section Start a collator node i run this command :

./target/release/parachain-collator \
--alice \
--collator \
--force-authoring \
--chain rococo-local-parachain-2000-raw.json \
--base-path /tmp/parachain/alice \
--port 40333 \
--ws-port 8844 \
-- \
--execution wasm \
--chain <relay chain raw chain spec> \
--port 30343 \
--ws-port 9977

in this section --chain <relay chain raw chain spec> \ i used rococo-local-parachain-2000-raw.json but i got this error :

2022-07-11 20:02:31 ⛓ Native runtime: template-parachain-1 (template-parachain-0.tx1.au1)
Error: Input("Relay chain argument error: Invalid input: Error parsing spec file: unknown field relay_chain at line 75 column 1")

what's the problem? how can i solve this error ???

  • Provide your chain spec file? It likely is a simple error that could not parse. Perhaps try an ide with error detection for json formatting.
    – Nuke
    Commented Jul 13, 2022 at 5:11
  • Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking.
    – Community Bot
    Commented Jul 19, 2022 at 10:17

1 Answer 1


you need to use the relay chain spec in --chain <relay chain raw chain spec> \, for example the one created for rococo-local with the command

polkadot build-spec --chain rococo-local --disable-default-bootnode --raw > rococo-local.json



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