Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e58ae88342d03e044d60ddb4b6fc5fd2bdf0d7bf54932595e9d2e9e9c5052a28:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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