Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 484e915352cd4a690cef0ead032ca5187b611695d504d518631b1a4e6e924e53:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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