Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 04180397a5b6c7d9d754a3a8911fb03234c321fb2fa994a62d32b4fc5ba0fcf8:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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