Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 705dbe3e57d8b8e5368fbb8a6dc0d1c1e4a256b5ef75888f6f37dcc998d843d9:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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