Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 65c516f8ba8b1d8e8a6f5c95b0cff1874a878776f0b7dc9687a008d246a55628:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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