Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 17a6103201221478306e9e685ec62fe508c5430474a2cc8f6d368df628d53af0:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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