Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ba604a24864a499d836d4b54157e22eefe78fdf9bc4b759e9bebe87513b3ed76:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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