Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 10e9d73e883253707ca8419d4dd179a8a47b0ff8d1f4a330ef2bc5f11d17093e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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