Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c8c78ab506b58a0ea3839d1980528459401bb30984bffe0c3ec912b3ce489b72:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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