I can't open a HRMP channel between the parachains

Question

I am testing XCM between parachain 2000 and parachain 2001 while referencing this link, How to open HRMP channels between parachains?. But I couldn't open a new HRMP channel, I faced the "Barrier" error.

It seems I should use Sudo or Governance as you said, but I could find neither of them in the "Developer" tag on the Polkadot.JS App.

So I added Sudo option as referencing the link - https://github.com/paritytech/polkadot/commit/791c8b8f9e6fe00b631f2cace0d6d65151487eb4. But after clicking the "Extrinsics->Sudo->sudo(call)" button, the Polkadot-js App crashed.

What am I missing now?

Answer 1

Since this tutorial is for example purposes, both parachains should have the sudo pallet configured. In a production chain this would be substituted with governance.

If you followed the Zombienet tutorial to launch the parachains, make sure your chain has the sudo pallet and create the binaries again.

Answer 2

The sudo tab will show up only when you have the sudo key in your wallet.

The governance tab will show up only when the runtime have pallet-democracy.

Answer 3

First, check if your runtime has a sudo pallet(like this line), if not, refer to this answer https://substrate.stackexchange.com/a/3203/1959 to introduce it.

And then, as xavier said, make sure the sudo key(like this line) in your wallet.