Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9e8d46bb3241e2bd44ec332b4389826963ed0c6e0d1e609f0ee9bf4838ba4642:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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