Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2e9062650f2382acb4e50fad43acf5a57cc01fa77a03aba0e2883fe818dd236d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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