Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 14ed0cc4d9a0eec59f86c8a1a6d85b37ef6d0a1fbfa588722d171bfb49308b9a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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