Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 64193f5e5b05ba5d2e4fbbe71d45f31c814a3fc139da4fd902697a59ac59e7cb:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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