Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> dbdf819ae1f72e1d90c59a918c50049bf0c9ca17ffaa7ede748b75b0bf469aaa:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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