Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 14ff4aa5e4763833862f2fb4f99ada690d8e807cede1fa36a687e25724bea42e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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