"Gas Estimation Failed" on mint function ERC-721 contract

Support Contracts
1

Deployed an NFT contract at:
0x31ead4b531266d9e125f7b3223ecd7E7ECcbd94c

Was able to mint 1 NFT successfully but looks like I may have formatted the IPFS link wrong.
The same contract deployed on Ropsten works well and mints without issues.

After minting once on mainnet, the second attempt gave a "Gas estimation failed" error

I'm sure I screwed up something basic here but can't figure out why it worked once & then started giving this error.

VERY basic contract:

:1234: Code to reproduce

// SPDX-License-Identifier: MIT
pragma solidity 0.8.6;
 
import "https://github.com/0xcert/ethereum-erc721/src/contracts/tokens/nf-token-metadata.sol";
import "https://github.com/0xcert/ethereum-erc721/src/contracts/ownership/ownable.sol";
 
contract SenecaNFT is NFTokenMetadata, Ownable {
 
  constructor() {
    nftName = "SeNFT";
    nftSymbol = "SEN";
  }
 
  function mint(address _to, uint256 _tokenId, string calldata _uri) external onlyOwner {
    super._mint(_to, _tokenId);
    super._setTokenUri(_tokenId, _uri);
  }
 
}

:computer: Environment

2

Hi, welcome! :wave:

I just deployed your code and had a try, it worked well, just called the function mint twice

mint(Account, 0, "test link")
mint(Account, 1, "test link")

you can find all the transactions all at here: SenecaNFT | 0xdFd5D67e46C80c4c9537039ea19e428E27C7777c (etherscan.io)

So I am not sure what is your problems, so could you please share your failed transaction?

3

Screen Shot 2022-01-02 at 7.48.16 PM
Screen Shot 2022-01-02 at 7.48.16 PM1032×612 63.6 KB

This is the error I'm getting in Remix. I'm very novice at this. It seems that I've likely inadvertently changed something locally in Remix but I can't figure it out.

4

Emmmm, so could you please share your parameters when you try to call mint() again?

5

Just filling in the 3 inputs:
to: 0xf53BCD08714938E53CC04b937434BA7063a3e839
id: (putting in any number string)
uri: This time I'm trying an IPFS link hosted on Pinata

Regardless of how I enter (or even leave blank), it pops this same error:

Screen Shot 2022-01-04 at 10.50.10 AM
Screen Shot 2022-01-04 at 10.50.10 AM2090×460 20 KB

6

OMG... I fixed it. I knew I was doing something STUPID...

I was entering in the same "Token ID"...making a duplicate, essentially.
The error was telling me right there that the transaction would fail (in addition to using up gas).

The interesting part that screwed me up is that I was able to mint multiples with this contract on Ropsten using the same Token ID. It just added them as additional holdings under separate ERC-721 entries (different entry for each token ID it seemed)

It seems like there are small differences in the way Ropsten & Mainnet behave

1 Like
7

Realizing now that I'm STILL stuck though with my original issue I suppose, although a much simpler one I think:

The input for "uri"

I had assumed this was a simple URL link to an image, but it seems not. If I'm understanding right, you need a .json file linked with your ipfs image that has your metadata & such...

I'm not trying to do anything complicated here, just give an image a title and get it to display on Opensea, Mintable, etc...

What is the input format for that uri part?

8

Emmm, I think this can be an API, such as https://my-json-server.typicode.com/abcoathup/samplenft/tokens/, and maybe you can have a look in this tutorial, it explains about the MetaData