Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a1f3a06721d32027c294891a9dcdf7abc848915d57d320a48b11165f9cd9f170:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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