Error: invalid type (argument="type", value="s", code=INVALID_ARGUMENT, version=abi/5.7.0) Web3.js

Question

I'm trying to call using web3.js a read-only methods, but I'm having the following error:

Error: invalid type (argument="type", value="s", code=INVALID_ARGUMENT, version=abi/5.7.0)  

This is the code I use to call the method:

signedContract.methods.getEnabledCurrencies().call().then(console.log)

While the following is the ABI of my method:

 {  type: 'function',
    name: 'getEnabledCurrencies',
    constant: true,
    stateMutability: 'view',
    payable: false,
    inputs: [],
    outputs: [ [Object] ]
  }

The function on the smart contract is the following:

function getEnabledCurrencies() public view returns (string[] memory) {
    return currencyNames;
}

I can use the same signedContract object to call state changing methods without any problems.

Answer 1

Try changing outputs in the ABI to:

"outputs": [
    {
        "internalType": "string[]",
        "name": "",
        "type": "string[]"
    }
]