Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4df84a4dd7b4aeec696e77608998f9b8b69ec40e449dff7229cc3be73277a997:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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