Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 29a6cfedfa2375b556fc968bb6d4dde405b1318e5cd0f5ee8b97006ddc31bfa6:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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