Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 65e28581f7e5fc89276f5abefb9394d09aa3cf0a8e3fe886ef973ea9a4f9a23a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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