Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 736130e33e428f9059dbeafd9b308d707f12b4b7b3e768000a0c42f71c1ee5d1:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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