Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d0897dc6ee05637897226f9fc311fb748e64b018df5f546d54fe8fe595aa8e45:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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