Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c2ca05d72410b0065b798544807a168163c1646eea61d7557dc18491d0dfd411:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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