Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 479541ef2f986a06b7dbc017cc7e3016282c1e5d770a31e9f7de0c861f151cb5:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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