Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2307fc0a5ca9a519a4427666cee3acfb30088c9183da5be8f0a7b9e08be49c6e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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