Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> cad322de8424dd8bc706ba60495d4d3c7cce6ef6cc7689a760748f7283dccd69:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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