Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a7b010ec2bbb6ae35ec6846adb540ad37ae9f1c20f72e0afd690aae4813a5a10:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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