Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a7fc382e9bafecd1094a63ecb7bafd436e68afb477e52528e2d63b67b52378ae:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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