Hardhat "function call to a non-contract account" error

non-contract-account.md

If you get this error in Hardhat:

Transaction reverted: function call to a non-contract account

It means that your transaction is (at some point) making a call to an address that is not a contract. There are two common scenarios where this happen.

Wrong argument

A simple example of how this could happen is if you have these two contracts:

contract Foo {
  function f() public {}
}

contract FooCaller {
  function callFoo(Foo foo) public {
    foo.f();
  }
}

And you execute this code:

const [signer] = await ethers.getSigners();

const Foo = await ethers.getContractFactory("Foo");
const foo = await Foo.deploy();
await foo.deployed();

const FooCaller = await ethers.getContractFactory("FooCaller");
const fooCaller = await FooCaller.deploy();
await fooCaller.deployed();

await fooCaller.callFoo(signer.address);

In this case, you'll get this error:

Error: Transaction reverted: function call to a non-contract account
    at FooCaller.callFoo (contracts/Foo.sol:7)

Did you catch the mistake? The last line of the script uses signer.address instead of foo.address.

Notice that the stack trace tells you exactly in which line the error was (contracts/Foo.sol:7). In this example is pretty obvious that that was the problematic line, but in more complex projects the stack trace should point you in the right direction.

Wrong network

Another common cause for this error is to assume that some contract exists when it doesn't. Typically this happens because you are accidentally using the wrong network. For example, maybe you are using Hardhat's forking mode, but you are forking the wrong network. If you are forking from a specific block number, it can also be the case that you are using an old block number and the contract you expect to exist hasn't been deployed yet.

I reckon its the latter of the two.

I am using IUniswapV3Factory(uniswapfactoryAddress).createPool. This should create a pool, however if the contract address does not exist in the hardhat network, it will not. I posted on the disc server and made a thread, indicating the error when I run:

yarn coverage --network rinkeby.

please let me know if you would rather we continue here or on disc!

I am also getting the Error: Transaction reverted: function call to a non-contract account when I run the test on the polygone fork in Hardhat.
In my test, I deploy my contract and then call the makeFlashLoan function in my contract which in turn calls the flashloan function on the vault contract from the balancer for flashloan.
yes, I have checked that I am passing the correct address for the vault contract.

OK I posted my question here: https://ethereum.stackexchange.com/questions/149616/error-transaction-reverted-function-call-to-a-non-contract-account-when-callin
I even deployed my contract on goerli to see if I get the flashLoan and it works as intended: https://goerli.etherscan.io/tx/0x9db8879b9d8ff509d19534ad6e4e39a87619139aa4ffc853a6e0e6a50b479bec
Can't seem to figure out why it says no contract present even tho vault address is correct and I have hardcoded it in the contract so it's same on the polygon and goerli (where I tested).