Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 367ba7632b069c45e44ca6e82a108fe18cc4c0664babfde264db3ec7de6e6ceb:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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