Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7d6875b9eb5afcaa1f419c308b4ded8c809612b2626f5d5a0b49ce1aa01c8fc4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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