Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 606b53a08a43ecd2f5794549bbca7c08d8a2967b78afde9d2311f8cd0ebad097:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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