Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3900d79be5c2971d06e7bdbc18868a72f6fd5e4309b4f2ad97e7e0edc7df132f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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