Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2fc58e1ad1fb4245c3d92b1e93a0be25818403018ecf741dcb7cbbc1cb93fdfe:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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