Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 700ce687ece8a811cfe0e93d5bb1050aaa6b3f9197a4821358cacc7432c29824:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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