Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d9bdf68f5708b30b63954e84ec7c5016bc4e436c989a0f8eb3bfd24c253ff525:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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