Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c74a9f1c7654bef9ae4e76bfe60d39976d0793e160b04dc099d00d5ab308ae21:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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