devpavan04 / cryptoboys-nft-marketplace Goto Github PK

Unhandled Rejection (TypeError): Cannot read properties of null (reading 'toNumber')

Dear devpavan

I followed all the instructions successfully but the following error shows:

CRYPTO BOYS CONTRACT NOT DEPLOYED TO THIS NETWORK.
Connect Metamask to Kovan Testnet Or Localhost 7545 running a custom RPC like Ganache.

Here is the truffle test:

Compiling your contracts...
===========================
✔ Fetching solc version list from solc-bin. Attempt #1
> Compiling ./src/contracts/CryptoBoys.sol
> Compiling ./src/contracts/ERC721.sol
> Compiling ./src/contracts/Migrations.sol
> Artifacts written to /var/folders/bw/3p5s80wx4j9317z2v18mf3d00000gn/T/test--35348-0C4qIofrLlt0
> Compiled successfully using:
   - solc: 0.7.6+commit.7338295f.Emscripten.clang



  Contract: Crypto Boys
    Deployment
      ✓ contract has an address
      ✓ has a name (224ms)
      ✓ has a symbol
    application features
      ✓ allows users to mint ERC721 token (2547ms)
      ✓ returns address of the token's owner
      ✓ returns metadata of a token
      ✓ returns total number of tokens minted so far
      ✓ returns total number of tokens owned by an address
      ✓ allows users to buy token for specified ethers (965ms)
      ✓ allows users to change token price (628ms)
      ✓ allows users to toggle between setting the token for sale or not for sale (391ms)


  11 passing (6s)

You should upgrade to Sepolia network

Thanks for sharing such a great NFT market implementation! However, I found a hidden but critical issue, that is when the second NFT to be mint, the MetaMask always claims a transaction error.

I tried to debug the contract but sadly I failed to find the real cause :< so I decide to report the issue to you!

Best!

contracts/CryptoBoys.sol:8:24: DeclarationError: Identifier not found or not unique.
contract CryptoBoys is ERC721 {

when deploy to Remix

TypeError: Cannot destructure property 'contractName' of 'contract' as it is undefined.
at forContract (/usr/local/lib/node_modules/truffle/build/webpack:/packages/compile-common/dist/src/shims/NewToLegacy.js:5:13)
at Array.map ()
at Object.save (/usr/local/lib/node_modules/truffle/build/webpack:/packages/workflow-compile/index.js:123:1)
at Object.module.exports [as run] (/usr/local/lib/node_modules/truffle/build/webpack:/packages/core/lib/commands/compile/run.js:38:1)
at Command.run (/usr/local/lib/node_modules/truffle/build/webpack:/packages/core/lib/command.js:189:1)