Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c9a595951bd0dbb2d908e74a64ae7ad0a0c233aec4babc9241740f22249cee20:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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