Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3879cf4a64a6a64db1d103bcda60f6f8f932b5f7d9f91504f97915fe49362d18:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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