Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7252e841fa196eb14c3b8d70cb6bec9aa4e79549d751178a158fabd9510a0cee:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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