Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 674f11cc44749928a9849988c8cb89ee90f787a41b0c2a878d138cec678da8d3:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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