Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 601e66eb9bbab5912cbda15a3b811fda827179308d93f39d87c718c876c46672:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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