Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e119d8f52241187bf53296b764997bd6b29003f2ff64dde6e96f0c95f78e52a5:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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