Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9323d7fd94ed5fad961d5abd0856e2608100b5b7fe488c8d4493d2b16f69c2bc:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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