Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9408913706d34862c2343dd3abbc5ec4278531ce9aa9113c3a5a817b48b17690:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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