Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5fb54cc06556b2308e457790a8854ce8e2a58713779fd636a0828cb8db030d3d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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