Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e775097e400a17a7c577617118e1fd65155b142441ee08f87911c476b6f2bbe7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

error: pre-condition failed: listing has already been purchased
   --> 4eb8a10cb9f87357.NFTStorefront:243:16