Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 294e0832f73e7a4e6999c916dda080d2db71aebf5e7a9b23fa3a63d74b9c5658:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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