Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 39c0dbf56556a8eaee7366ba6233a10e61762209bf0d8f86b3eb3edcde930fd8:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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