Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a4241d100286cc8378d20072813bd3cce8e86d243009d6cf2967efc901f81647:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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