Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 31383c614f963b8a13d06a6b0506b8d65c7707d81c4bb6b5a4edc2e32e5bae6a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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