Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ce1b589da963a84bb770166074f6482c368ad4ee3a273419b30b20a7e862a047:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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