Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b88e5a081a43efa085d4f9c72a2381dd9ed4e97535527503a73c3212251894f7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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