Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a42cbcca493213a55af4dd5373ed0811e0cd4e59e6a03d43bdbfd88c2858f40d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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