Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b444c4ffd8c1bceaa135c19d4f4a2a9240883e309110fe1d8a454d5624c6aab7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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