Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c8c1621bd37e5a530447efc5bf6abba7b5ce69a2900d4626ae4882c74f81e976:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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