Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 96437a56040d68e6ec5a2903933af9c8d0ae148369262e00022bb5a874a08e61:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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