Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3d2fdb0976ee5c2f9e67f313c4d2a1651a2a929880f80d1c37527f2d43b98457:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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