Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> af8c076fd2785b37d308d9271de4e6c8abbef727da0ae8acbbe648b589cd74ad:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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