Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5d9ee59cd53f096a9771ce9ab776918ef0aa831190f2217ccaff99e24db46e05:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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