Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0f26d28b2773eab50667012b37d493d2ac1c71d0ef30d6a09560ed9a46834258:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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