Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1a3feb04a08c87531847e0605eceffe0b7a2026b812771fc2201ac3d2b2a579b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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