Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 165e54c7a482284d900f14b1e7dbd37747a2842dbd959aaca99caf8e6e7044d8:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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