Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 610473c774cfd6c0972ce5f255f81b4009666a4c72f382f207e9bd4cb480ff77:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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