Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 76d803d47e5aee7783b7c4e99c42a45e37ce5c9ca8ae0877aa63ca529c80fd30:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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