Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f6c0b5a4d476a3dc85af47ddc43946956249e2bfbcacf7b913770046498e8d6b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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