Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a4e3b204a2359b70c5a00daf9591407bd2497bd5fe5b681c90b91ae14416c713:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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