Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 02bc6258597c3b9d0577ffad2619a27c935801d114f886f46d1fdf4a73998c52:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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