Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2475fb033391df27b0c8629cd2dbba4b9a8e690bf642f36f15f5c9e14bc52870:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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