Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5046f9f9774c95b90d5ca5bf6a8a2e4e75094e1e229f0b11f75077480c905c6e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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