Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b0fd1f991b3c5e0370f6cfd73e0b792d4d8db32966809e9e8022d8e05d04dcf7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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