Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7584dec2db474517f62f55085ff6f9119d2812a48a109f5202bd46061cf60f3e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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