Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e37438980f2ea8a78139d9941f0a90246a43d5d6d2719caea84b7fd11d320687:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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