Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3153021ee298e21872d71446de686d3444aac05058bb2f7aeeb1f6d6e1c86e68:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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