Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5769f9acfaa7fc053809e8dc68a4ae2774413e3c91a0796d42f127a902b878a2:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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