Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 94c55d8649f348e8dab60644d040977a2ac344e9a0ee35877b6ff0b2b53d9d82:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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