Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e642204a12492d9f970c8d3f0204a311e4394e80e3e0609370dcc66c4aa2b9ff:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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