Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0b17c968b271eb868426b1b314d2c8f2e9b4fc8486bafc812083f2658f07e4f2:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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