Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a09285ca8a2b2974620e0b2a32d29793f4f4bb0c95fb558f0e2f86a5ad3eb2dc:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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