Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> dc6b892a53febefabcdb42e35c3de3ee184409bbe3e4aeb4b0ce2f5b0766a9e1:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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