`UnknownTransaction::CannotLookup` error on each extrinsic

Question

I've implemented unified accounts in a NPoS consensus-based substrate chain, and modified the polkadot-js/apps accordingly as well. The transactions through metamask go through successfully, but I'm getting this (screenshot attached) error on each extrinsic performed through the polkadot-js/apps. These are the types that I've added to polkadot-js/apps/packages/apps-config/src/api/typesBundle.ts:

"types": [
    {
      "minmax": [
        0,
        null
      ],
      "types": {
        "AccountId": "EthereumAccountId",
        "AccountId20": "EthereumAccountId",
        "AccountId32": "EthereumAccountId",
        "Address": "AccountId",
        "LookupSource": "AccountId",
        "Lookup0": "AccountId",
        "EthereumSignature": {
          "r": "H256",
          "s": "H256",
          "v": "U8"
        },
        "ExtrinsicSignature": "EthereumSignature"
      }
    }
  ]

Answer 1

I've fixed it by making these changes in my runtime:

1. In the frame_system::Config, changed Lookup from type Lookup = AccountIdLookup<AccountId, ()>; to type Lookup = sp_runtime::traits::IdentityLookup<AccountId>;.
2. And changed the Address type from pub type Address = sp_runtime::MultiAddress<AccountId, ()>; to pub type Address = AccountId;

where AccountId is the AccountId20.