Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 74675c8d0d2d7f62fc66767320dcff977560f6df2bc32eaf66f0a1d1e9635287:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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