Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9b9446f360fd0e9c1f684e0ed8b2db67d289c1d8fd7b48a01f480e318ce350ae:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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