Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d7dc3c3ecd77d224a831f3a3c389d6f2c123676b8d001cf03437673628f8e261:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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