Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9fb52255fddea1e5f03835548430d15019c7a9e77ef502c94a7daa27b0639c1c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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