Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0a1f768d67bb1b3391c1d7eb24af48a009abae438bdc3f445899ae9e380318c3:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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