Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ce725ff84d7b3e88cef3a2feba2bfdb185dd6055e96738316133a31255afbd23:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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