Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c924560a5110757dbfaf5738c5e2e85e5dec8a67fbe995338ef61f5645c537a6:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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