Cannot invoke contract functions

Hello, I am new to starknet js. I’m trying to invoke a function of a contract using this code :

        const { transaction_hash: transferTxHash } = await account.execute(
            {
                contractAddress: eykarCommunityContract.address,
                entrypoint: "completeQuest",
                calldata: [questId, player],
            },
            undefined,
            { maxFee: "0" }
        );

But I get this error:

TypeError: Cannot read properties of undefined (reading '0')
    at Account.<anonymous> (/home/nicolas/Desktop/Nico/eykar/API/node_modules/starknet/dist/account/default.js:125:92)

So I went to /home/nicolas/Desktop/Nico/eykar/API/node_modules/starknet/dist/account/default.js:125:92

the error is here:

    Account.prototype.getNonce = function () {
        return __awaiter(this, void 0, void 0, function () {
            var result;
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0: return [4 /*yield*/, this.callContract({
                            contractAddress: this.address,
                            entrypoint: 'get_nonce',
                        })];
                    case 1:
                        result = (_a.sent()).result;

                        // ------------------------------------------I Added a console.log -----------------------------------------
                        console.log(_a.sent())


                        return [2 /*return*/, (0, number_1.toHex)((0, number_1.toBN)(result[/*     THIS IS THE ERROR        */0]))];
                }
            });
        });
    };

So I printed the source of the “result” variable in the console (_a.sent()), and I get this:

[Object: null prototype] {
  code: 'StarkErrorCode.MALFORMED_REQUEST',
  message: "can't use a string pattern on a bytes-like object"
}

So there’s definitely something I missed (this is the first time I’ve done this). If you have an idea of the problem, don’t hesitate. Thank you in advance

[Marchand-Nicolas]

I solved the problem by changing my account. I used an account generated on ArgentX. (and the .toLowerCase() helped me with the address given by ArgentX)

[0x25cfb68]

I just faced this issue too, like you did I was able to track it down to getNonce (link)

I noticed that this call fails if the address has capital letters (checksumed):

const { result } = await this.callContract({
  contractAddress: this.address,
  entrypoint: 'get_nonce',
});

looks like Starknet fails to make calls to contracts with checksumed address, the weird thing is that executing calls works without needing to lowercase the address 🤔

when I updated my account initialization it worked

const account = new Account(
   defaultProvider,
   process.env[`ACCOUNT_ADDRESS`].toLowerCase(),
   ec.getKeyPair(import.meta.env[`ACCOUNT_PRIVATE_KEY`])
);

PS: I copied the address straight from Argent wallet without noticing it was checksumed.