Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 966b0eb029cf29a1f9c8f7860c16ded9a6705383cbed2896bd4e5ea3544d50eb:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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