Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 09bdc4d11ff5a5dd8f40ef847a9a83b7aa1009d14755e22377278f4ea5cd4a27:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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