Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 23458815696637cb1f8cfd74ce00adb630a7fbbb297c1a2c93b0d396ee643e9f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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