Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2fce196080ec03680ccc9f7762e017356777cd3c4bd52687fe72cc7415bb6fbd:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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