Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d3a1d53f1cd669b8eeca90133ad7efaeb73c669335e9100f8e0e98e3c5c703e2:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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