Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3b1dc51e63873cc0f71e6028c8f2bb1f734dc8d1c4c9269bceb7e6930277cfea:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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