Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5dab939969b040a9a9951ca9b55f77b4ca5de13e454c4308eea1fa7a0801836b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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