Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 063d5f1cfe9222ad55a459b0e8ff201aee43176fb322d30252244053c89baf96:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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