Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4805834d56fae1ee196ab54ffd59ab32e998d748335198b629f0e8237b1c0da1:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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