Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> bede4b6dd6c88f5a6a4ce1ef3ebf1115bcd2f480738e351713c04be831f36d05:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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