Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 51807c03517b4522ec33eb08e35a2a9d04af56c2c596966e315cdcb1fabb10f7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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