Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b672e1a3cb6f217b2f73457fde0c5b294efce2067445e02cff682b230361a16c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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