Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4ee79bec51746bc03e7fcfedc7d199c25660ca0629c4151b42c7cc31705cfd4d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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