Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1e1a80e908326ee34ae82ad4e6f4efe4c23c7471bbc2e9bc29bae41698660e2d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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