Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> fc720ccccaf24a1f536eea3e1795af32ce69bba7dde38464cd2263f3aaefbf94:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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