Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 52f6f3ce65bd132b26e85fe87ec178e12cda6aecfa954b4ed41e60a6a1ede60c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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