Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> cc60fc22bfacc7eaedc34a80f7a144d45798e8eb7e51fd3b129ba2e6af3e3bf2:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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