Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ca0f764c492865e7089fd06d0a3d7c07a716c37f6def67402e77805ba3e6ecae:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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