Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a3002d0bbc59884378dd0fe9fb0ab58cee78436cc7b711fd14fc3a5b308d79d7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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