Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0a8f76a66b6a0cd886ab0a7f831bce55a8ed194d5182bf8c5fb9fd5772f38488:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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