Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 892fc2ba2650f3854adadffe7d32863574e5d5d739f279be887c8632a4c0a7bf:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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