Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f3a85ed06428359159d664630347e8ed8398e3c5ba710b45e3f4d06513882c3f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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