Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 59b5ea66a40b248e1b77c4899553d75613f4ff631bd9128a10cdfe48b7a47409:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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