Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 774082348ae5c85493c6384b6a8305aab314eea106e32eef25ce3f52ecb93477:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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