Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 6d3b09c61992a12c347939cc77b9e9f26c580e1b0ceb650ec59ee20393dee2b6:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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