Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9fb5396470c31590c5911af9faa7f7c810e5da3fa0b6cd4440c7c2f6fd61779b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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