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?