Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> dd3529541e38a89723a7a91e8fb514cf6178ec0a70a2200e80055900601e5fa4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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