Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ba43acea6e921782faba921fbca2d44bdfd52a9f34b16818b55d86910d3ce82c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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