Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 44f9a56a3547fa451c797a0898b12a8c72491548127326454c75610944afe4aa:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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