Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a100b1f3e660dd546695329c306cd30fa73ec26dcbdb5705e8565c89a273eca1:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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