Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 6a0829eb18ff1b9095394b4f7688a1bef10aeb7397fa9e6c56209a5c98ac44bb:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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