Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ca62b3cf6d38d9e5aa5bce375933fde2389b1c8905293f462a703b66282baa51:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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