Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b11ea4a76ca2652b3fe9c66c5a9b344891d6964c84896f318aed75c8b5460226:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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