Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> cc074c70d501df8a9cc87ac8b6c17ef670c32cf79847fd4a322722074946ac29:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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