Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b48b4bc5b2d89e5fd7b41abf3f6ff82df77742658f28de170b68c2f91cb9399f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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