I can give you an article on this topic.

Ethereum: Error of an unregistered identifier because _tete (tokenid) function does not exist (has been removed from?) ERC721

As a developer who creates intelligent contracts for feeding Soul tokens, you may have come across a terrible “unregistered identifier error” and you are trying to access specific brand metadades. Specifically, you have problems with the “ERC721” standard and its function (tokenid).

What’s the matter?

Standard ERC721 is a set of rules to create and manage unique collections of tokens and manage Blockchain Ethereum. One of these rules is related to the control that the collection has a given brand ID before trying to obtain or handle its metadates. Some versions were actually removed from ERC721 from ERC721 from ERC721 from ERC721 actually removed the function to check if the marker with the ID specified.

problem:

When you call ERC721.get (_etist (tokenid))“ Ethereum causes a mistake because he doesn't know if the brand ID exists or not. This error is due to the removal of "_entis" ERC721, which is no longer necessary to access the metadates.

solutions and solutions

You can use one of two solutions to overcome this problem:

• Introduce an alternative method : Instead of relying on the “ERC721” standard to verify that the marker exists, you can implement your logic to test the existence of tokens. This approach may require further development efforts, but provides more control over your contract.

• Use a library or external solution

  : There are third -party libraries and tools that provide ERC721 functions including_ These solutions often rely on standard industry libraries and can make developments easier.

Further considerations

Before implementing any solution you note:

* Validation ID token : Make sure you have confirmed the “tokenide” parameter to prevent errors or invalid input.

* TOKEN METADATA TABLE : Make sure you have access to the correct brand metadata calling features such as _etts.

* Location and check of the agreement : Make sure your contract is properly placed and thoroughly tested before placing it in the test network or live.

Conclusion

The establishment of intelligent SOUL chip falsification treaties can be difficult, but understanding the reasons for the error of the illegal identifier in ERC721 is important. By studying alternative methods or using a third party libraries, you can solve this problem and create high -quality and functional intelligent contracts that meet your requirements.

Do not forget to maintain recent events in the development of blockchain development and intelligent contracts, as new standards and implementation are constantly emerging.

—–

I hope this article will help!

ethereum efficient whitelisting