Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ccf6f14a873cb761e0c429a20afdf308cf8afd8906c8372cb924dd172edf6fae:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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