Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c922c89caab8ea4d956ea02e8605c82cda88ce0ced6b91b8ea891c8cd60b9ecc:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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