Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> cdd304d33eded301cc3d655c98a20b0f82da78e0b792e966db4516fa973f5b84:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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