Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d21aab88f20ca4ee808c49ca21d2445da5d985c3640464471cbe00f82cb068e0:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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