Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 978d33446a9305771edbd9fda35a841801f0fe62fbba9269f0e8f98f51354e39:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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