Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5b5f4a6919a5e95246d57b0d47271ea5ecdecc17dfc1a33a60d4d8cf8652b270:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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