Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 54a6012156d705fdfcb159885c562a626cf33e91b523ea0845d8ff98567bf814:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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