Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> bb30d037d9dbe38252b0621f86af89a7b2bd419e6b05146b8aa8c26b7fcec7b9:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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