Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 142b1e9c8769280cc491c2808d49fb7ae5cea9f3e9ed66c1ed5a2169b5058068:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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