Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 452d613111077a8a1cbb035d89fa23218b198fd4dd32a71026eb8abe2de9ab5e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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