Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d49073f924355e9ccc4f1fadfb4500b0ad2687d74c7d058d55c0fef6a4004e84:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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