Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3a41fa331affb023f61f0a19e8db869d0b8d774eff979c6a7ca1e5e1b48137b1:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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