Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d87426e5689d8f85fd9f085f011dde6cc41923d7ff65b15ed322db232750f33c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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