Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d96038c6b513e5f0e4582b37c4948f626aabec86d29b11f5a6d306567b6d8a99:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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