Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 875452c75f9f4a0f0a3e1ffa8b388c5712f109f9f43d1055db91e234a1622fa6:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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