error[markdown-rel-links]: non-relative link or image --> ERCS/erc-7921.md | 16 | This proposal is an extension of [ERC-721](https://github.com/ethereum/ERCs/blob/master/ERCS/erc-721.md). This proposal introduces a... | = help: see https://ethereum.github.io/eipw/markdown-rel-links/

error[preamble-author]: authors in the preamble must match the expected format --> ERCS/erc-7921.md:5:8 | 5 | author: Allen Dong(@Allen2730), Lonika Zhang([email protected]), Steven He([email protected]) | ^^^^^^^^^^^^^^^^^^^^^^^ unrecognized author | = help: Try `Random J. User (@username) <[email protected]>` for an author with a GitHub username plus email. = help: Try `Random J. User (@username)` for an author with a GitHub username. = help: Try `Random J. User <[email protected]>` for an author with an email. = help: Try `Random J. User` for an author without contact information. = help: see https://ethereum.github.io/eipw/preamble-author/

error[preamble-author]: authors in the preamble must match the expected format --> ERCS/erc-7921.md:5:32 | 5 | author: Allen Dong(@Allen2730), Lonika Zhang([email protected]), Steven He([email protected]) | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unrecognized author | = help: Try `Random J. User (@username) <[email protected]>` for an author with a GitHub username plus email. = help: Try `Random J. User (@username)` for an author with a GitHub username. = help: Try `Random J. User <[email protected]>` for an author with an email. = help: Try `Random J. User` for an author without contact information.

error[preamble-author]: authors in the preamble must match the expected format --> ERCS/erc-7921.md:5:67 | 5 | author: Allen Dong(@Allen2730), Lonika Zhang([email protected]), Steven He([email protected]) | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unrecognized author | = help: Try `Random J. User (@username) <[email protected]>` for an author with a GitHub username plus email. = help: Try `Random J. User (@username)` for an author with a GitHub username. = help: Try `Random J. User <[email protected]>` for an author with an email. = help: Try `Random J. User` for an author without contact information.

error[preamble-author]: preamble header `author` must contain at least one GitHub username --> ERCS/erc-7921.md | 5 | author: Allen Dong(@Allen2730), Lonika Zhang([email protected]), Steven He([email protected]) |

error[preamble-uint-requires]: preamble header `requires` items must be sorted in ascending order --> ERCS/erc-7921.md | 11 | requires: 721, 165 | = help: see https://ethereum.github.io/eipw/preamble-uint-requires/

validation found errors :(