This error means that the function you tried to call does not exist in the contract (`AccountClient.get_balance()` takes `token_address` as optional input, and calls `"balanceOf"` function on the contract deployed at token_address).

Your code is almost correct, except for the last part, where you specify `token_address` in
```call_result = account_client_testnet.get_balance_sync()```


So, the full code for getting the balance of an account should be:
```
account = AccountClient(
    client=GatewayClient(net="mainnet"),
    address="0x07f81ea93daf9c49494e3131b95646c3a8df5d97d151cc6484d49eaebe3e3d0a",
    key_pair=KeyPair(private_key=123, public_key=456),
    chain=StarknetChainId.MAINNET,
)
balance = account.get_balance_sync()
```

Newton

I try to execute a code with `get_balance_sync` method:
![get_balance_sync Cairo StarknetPy code sample](https://res.cloudinary.com/varga/image/upload/c_pad,b_auto:predominant,fl_preserve_transparency/v1670921600/code_image_spbt0g.jpg)

However, I got this error:

```
starknet_py.net.client_errors.ClientError: Client failed with code 500: {"code": "StarknetErrorCode.ENTRY_POINT_NOT_FOUND_IN_CONTRACT", "message": "Error at pc=0:10:\nGot an exception while executing a hint.\nCairo traceback (most recent call last):\nUnknown location (pc=0:228)\nUnknown location (pc=0:214)\n\nError in the called contract (0x7f81ea93daf9c49494e3131b95646c3a8df5d97d151cc6484d49eaebe3e3d0a):\nEntry point 0x2e4263afad30923c891518314c3c95dbe830a16874e8abc5777a9a20b54c76e not found in contract with class hash 0x3ae692aaf1ded26a0b58cf42490f757563850acea887ed57b4894fee8279063."}
```

Can you help me to resolve this?

StarknetPy Error in get_balance_sync (StarknetErrorCode.ENTRY_POINT_NOT_FOUND_IN_CONTRACT)

What is Starknet.js?

How do I create account using starknetjs?

How to select the network my Pathfinder node runs on?

How do I create AX (ArgentX) contract using starknetjs?

How do I get started with starknetjs?

There are many people who are pretty new to Cairo Language, so this thread is about some good resources, to begin with. What projects, educational courses, Github Repos etc. about StarkNet can you recommend?

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What resources (Github repos, projects) do you follow about Cairo Language? Why?

Some questions that could be answered separately.

1. The only way to invoke a contract is using migrations (this applies for both devnet and testnet?)
2. When doing a migration file I receive the “Hint is not whitelisted. This may indicate that this library function cannot be used in StarkNet contracts.” error. For example for this code:

```
%lang starknet

@external
func up() {
    %{
        contract_address = deploy_contract(
             "./build/main.json",
             config={"wait_for_acceptance": True}
        ).contract_address

        invoke(
            contract_address,
            "initialize",
            {"new_authority": 123},
            config={
                "auto_estimate_fee": True,
                "wait_for_acceptance": True,
            }
        )
    %}

    return ();
}
```

_This question was originally posted on [StarkNet Discord](https://www.newton.so/view?tags=discord)_

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StarknetPy Error in get_balance_sync (StarknetErrorCode.ENTRY_POINT_NOT_FOUND_IN_CONTRACT)

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