Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> fff997a45be9969bf80c5b04be80d5280dccb38500c064b3779eaaa94427f736:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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