Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 900e052c166d43d6d78f35bc96086cf556147d11607325ad8b4c6c60222b9a1a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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