Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c55bd8e3910f1fa1a2fbe412c5c304a7addb2baa8ff7adc826195d8d114e39c7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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