Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b8e11c92bc6b01df09bbdbd5db54a5cffbafba6d3e9dcd888cc8719ec61fb70f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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