Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a647ef6fef9742387f4a225450f8b956af1004fd5b316a6d91cb180f84646b8a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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