Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 897ffcba3749f7478ad523ade8547f21a34b9c0e9124f47cf100aa2f6384bea7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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