Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 40673a4697d86a9625101e53aa4299783d0099d27bb6086b48bb565e51803b71:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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