Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b5770b8ddba986f20a09f178267dcf956e344e05eb217085ba6dc3ec2e620f0f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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