Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5815a4ad653c9c9b3b3a760b3dfc6756b8bb80df5e26c3d6a087aa06138d3ac8:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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