Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 17990ee9a854f8415343a7bed5a04d13f7fc1aa7abc86eaa97005267e8d84e4f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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