Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 072b0eb076faee8efc8956a21e59f4d0128e65d39679cd88ba61bd4cf413b4c3:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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