Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 106a64910d2dc675568468e9994310c8893554477a0c1378a1764b13b7f8e384:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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