Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 95cf7669d9b5443f627821e52741bd57524fae7a3d628422c6e6ba1644ae21bc:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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