Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ef666f6d3e5e84a2521ed4add44e1918220f25db75ba5771a3975a2b30ccdd99:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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