Klaytn IDE 인터페이스가 바뀌어서 그런지 몰라도 뭔가 좀 안되네유

Question

ERC-721 실습 -> 계정 발란스 & 토큰 소유자 편 보고 있는데요,   1. run하기 전에 account 선택하는 창도 안보이고 2. run 누르면 not found remix_tests.sol 이라고 뜨네요   코드는 아래와 같이 따라서 썼거든요 ㅠㅠ   // Klaytn IDE uses solidity 0.4.24, pragma   solidity   >= 0.4.24   <= 0.5.16 ; interface ERC721  /* is ERC165 */   {      event  Transfer ( address   indexed  _from ,   address   indexed  _to ,   uint256   indexed  _tokenId );      event  Approval ( address   indexed  _owner ,   address   indexed  _approved ,   uint256   indexed  _tokenId );      event  ApprovalForAll ( address   indexed  _owner ,   address   indexed  _operator ,   bool  _approved );      function  balanceOf ( address  _owner )   public   view   returns   ( uint256 );      function  ownerOf ( uint256  _tokenId )   public   view   returns   ( address );      function  safeTransferFrom ( address  _from ,   address  _to ,   uint256  _tokenId ,   bytes  data )   public ;      function  safeTransferFrom ( address  _from ,   address  _to ,   uint256  _tokenId )   public ;      function  transferFrom ( address  _from ,   address  _to ,   uint256  _tokenId )   public ;      function  approve ( address  _approved ,   uint256  _tokenId )   public ;      function  setApprovalForAll ( address  _operator ,   bool  _approved )   public ;      function  getApproved ( uint256  _tokenId )   public   view   returns   ( address );      function  isApprovedForAll ( address  _owner ,   address  _operator )   public   view   returns   ( bool ); } contract  ERC721Implementation  is  ERC721  {      mapping   ( uint256  =>  address )  tokenOwner ;      mapping   ( address  =>  uint256 )  ownedTokensCount ;      function  mint ( address  _to ,   uint  _tokenId )   public   {         tokenOwner [ _tokenId ]   =  _to ;         ownedTokensCount [ _to ]   +=   1 ;      }        function  balanceOf ( address  _owner )   public   view   returns   ( uint256 )   {          return  ownedTokensCount [ _owner ];      }      function  ownerOf ( uint256  _tokenId )   public   view   returns   ( address )   {          return  tokenOwner [ _tokenId ];               } }