You actually don't need to import the `range_check_ptr` but actually the `range_check` built-in (check this [link](https://www.cairo-lang.org/docs/how_cairo_works/builtins.html#the-builtins-directive)). Change your code to 
```
%builtins range_check
from starkware.cairo.common.math import abs_value

func main{range_check_ptr}() {
    let x = abs_value(-1);
    return ();
}
```

and it should compile and run.

# Hello world!

I try to implement the function `abs_value` of the package `starkware.cairo.common.math` but i have this error

```
AssertionError: Expected main to contain the following arguments (in this order): ['range_check_ptr_ptr']. Found: ['range_check_ptr'].
```

I dont understand the error. 

Can someone explain the error to me, why it happens ? 

> I am doing the challenge #17daysOfCairo of the day 3


Full code

```
%builtins range_check_ptr
from starkware.cairo.common.math import abs_value

func main{range_check_ptr}() {
    let x = abs_value(-1);
    return ();
}
```


chocolaite

AssertionError with range_check_ptr_ptr

Hey this message looks very confusing.
`GatewayError: {'contract_address': ['Expected hex string, got: "0x01C438231cD70f47d1acB8404E51734c1Fb4d79AC55813b3E861fB1EF78Da0D6".']}`

Any hints on this?

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

CairoLang error: `GatewayError: {'contract_address': ['Expected hex string, got: 

How can I send a Uint256 amount of ERC20 tokens from L1 to starknet?
I have "amount" as a uint256 on L1 but how should I build my payload for "`sendMessageToL2`" to match the Uint256 format of Cairo?

---

This question is participating in [Newton Bounties | Incentivized Test Program](https://www.notion.so/Newton-Bounties-Incentivized-Test-Program-94322ad48e7d40a3adcf36f6b26174cd) Every verified valid question gets $10 USDC (mainnet)

How can I send a Uint256 amount of ERC20 tokens from L1 to starknet? And how should I build my payload for "sendMessageToL2" to match the Uint256 format of Cairo?

# Is Kakarot zkEVM a blockchain?

Does Kakarot have its own consensus, finality, commitment to L1, blocks, etc.?

Is Kakarot zkEVM a blockchain?

## What is Kakarot, the zkEVM written in Cairo?


What is Kakarot, the zkEVM written in Cairo?

Hello, I am facing an issue with `starknet-devnet (v0.3.1)` . I do not manage to run RPC `starknet_addInvokeTransaction` with positional parameters; yet it works with pathfinder and other vers like `starknet_estimateFee`. It returns `int() can't convert non-string with explicit base`. It is working fine on GOERLI. I have document the case on the repo https://github.com/Shard-Labs/starknet-devnet/issues/282. Does anyone have an example of a positional request to `starknet_addInvokeTransaction` on devnet that is working? The test inside the testsuite is also using named parameters. Thank you for your help

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

Does anyone have an example of a positional request to `starknet_addInvokeTransaction` on devnet that is working?

 I was able to run those commands without setting up a StarkNet account

When you run warp deploy or warp invoke, which account is paying for the tx fees on the Goerli testnet?

Hey, is there anyway to debug Cairo contracts in hardhat environment? Something like hardhat console in Solidity?

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AssertionError with range_check_ptr_ptr

Hello world!

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