Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e5f465a6c8dd9f2204833278adecf0cf895ada862a00f65ee37bc15043396b45:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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