Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 55515dab45802ae1d5f3dd514118b1fcbb6871f33e8be4ea8088f7d9f7c69aff:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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