Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d47de5772846d08b74befcd926b14bc9bca8b8c55a8ffdcb149c4f29c3c155cc:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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