Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b55be0bfc5c874fcf79b3c38a8fa4d96f2555c4ee9aae75db5ec5643b9bc5343:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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