Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 01fc53e84532dc8550636b218b7de8d58aa402b1c1b44597461e24949313fd5c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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