Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 97d1a1417137db22b155c953aaa49e56067b237aa36c379326abaf43942042e0:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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