Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 6d48f0c56b9d4662ab8abd9f314217e10aabf927a10d7ec27ab0eb9434f3b65b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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