Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> aee23fd217d4a16388904b2f18aa19c7215030238ae3b9649c55ede7f73c93cb:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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