Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5f1ca8455ea0f556ef352be5b8e30c0257ac4f6de30d46fe775010ccae6d9bde:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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