Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d4368083349bfa8f7b3fa17f01435ea179e70cd8a7dbab398ea50e42d80e1eee:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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