Lesson#9: Can't call performUpkeep() manually from etherscan

[juliancabmar]

Hello to all o/

After of many attemps with my own Raffle contract, I deploy to sepolia the Patrick's contract (https://sepolia.etherscan.io/address/0x87376Fc5eFD5Dac63BB202Ed1B7838eDa39C4371), but I can't call manually the performUpkeep() function. I try with 0x and "0x" for arguments, but I still geetting the same "can't estimate gas" from Metamask and after ignore this, the transaction was reverted. So, if I can't do this manually... Chainlink keepers can't too.

Thanks a lot people.

[aaankeet]

@juliancabmar
There's Something wrong in your smart contract, Metamask is not able to estimate gas because something is off please check your variables properly and make sure if you have initialized them correctly. #5556

[juliancabmar]

I re-check the constructor arguments but nothing, so... I cloned the lesson#9 repository, put my sepolia Private key in the .env and I make two tests with the performUpkeep() call, one in the localhost network (opening a node) and another in the sepolia network

This is my script:

Far I can see, in the two cases the trasnsaction encounter the calculate_gas error, but in locahost was reverted by the custom Raffle__UpkeepNotNeeded.

I totally loss now.... any ideas?

PD: Oh.. by the way, I call performUpkeep() from etherscan too.... same error. :(

[RobItu]

Try checking to make sure that all the required variables are correct from your helper hardhat config. I had a similar problem and my callbackGas variable was a zero off.

Also can you post repo link?

[juliancabmar]

Hi Robltu, thanks for aswer. I use the lesson 9 repo (https://github.com/PatrickAlphaC/hardhat-smartcontract-lottery-fcc), rename .env.example to .env, and put my sepolia private key in it. Nothing more. If you want try yourself and tell me your results.
Regards

[aaankeet]

@juliancabmar make sure to change subscriptionId with your own subscriptionId in helper-hadhat-config.js.

[RobItu]

I cloned the repo and it worked for me. My steps:

1. git cloned lesson 9 repo (https://github.com/PatrickAlphaC/hardhat-smartcontract-lottery-fcc)
2. rename .env.example to .env, and put my Sepolia private key in it as well as Sepolia RPC URL
3. Registered a new VRF and Automation subscription and funded them 10 test LINK each
4. Changed VRF subscription variable in helper-hardhat-config.js
5. yarn hardhat deploy to deploy contract
6. yarn hardhat test to test unit (passed)
7. yarn hardhat test --network sepolia to test on testnet (performUpkeep called)

My VRF request is still pending however performUpkeep was called successfully by Chainlink Automation node.

[juliancabmar]

Hi Bobltu thanks for answer and sorry for the delay. I follow all steps point by point but I still getting the same error on performUpkeep call. You can share with me your contract address for testing?

Here is my helper-hardhat-config and my .env file (I dont care share it):

[aman879]

Do you have to call performeUpKeep manually??
I don't think you need to call it because it call automatically by checkUpkeep if statement is true.
I think if checkUpKeep return true it will automatically call performeUpKeep and change its value to false. So, if you call performeUpKeep manually it will revert because checkUpKeep will be false.

I don't know for sure.But I think we cant call performeUpKeep manually.

[aaankeet]

@juliancabmar
You have Incorrect vrfCoordinatorV2 address in your helper-hardhat-config.js for sepolia
this is the correct one 0x8103B0A8A00be2DDC778e6e7eaa21791Cd364625

[juliancabmar]

@juliancabmar You have Incorrect vrfCoordinatorV2 address in your helper-hardhat-config.js for sepolia this is the correct one 0x8103B0A8A00be2DDC778e6e7eaa21791Cd364625

Thanks to all for the answers. Yes, you are right aankeet... I updated the helper-hardhat-config.js, re-compiled and re-deploy, but the error persist.
Can someone share to me a Raffle contract address what works for testing?

Regards.

[juliancabmar]

Here I share my repo (with the .env included) https://github.com/juliancabmar/public-lottery-FCC.git try it and give me feedback please. Thanks o lot.

[aaankeet]

@juliancabmar

I've tested you code, inside your helper-hardhat-config.js

1.change callbackGasLimit: "2500000" to "500000"

2. Now Go here and Create a Subscription. Copy & paste subscription id in your helper-hardhat-config.js for Sepolia.

3. Now deploy your raffle & make sure you are not using the old deployment ( since you are using save deployments in your hardhat-config.js you can turn it off).

4. Now Fund your subscription with appropriate amount through the dashboard.

5. Add consumer, paste your newly deployed raffle contract's address.

6. Now make two entries in your raffle with different accounts through Etherscan.

7. Now you can call performUpkeep.

8. wait for few seconds.

9. Reload the page and check for recent winner.

Hope this works

Here is my deployed Raffle Address - 0xF7439Ba58b0d17eEB9016C9769475a7bC218E1f9

[juliancabmar]

Finally!!! Thanks a lot aaankeet for all the effort.
I follow all the steps and work like a charm. Digging more I found what the problem was what I keep the VRF consumer address of a previous contract; That trigger the gas error. Regards.