Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4162b4477d9b7335f5fabb31454d5eede0e288205dfbddbe2fafd2e5e3f039f5:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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