Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 492418b8387f947aa30fd25e535660d097726634b02f38d5a3412b67b05d6c8f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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