Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ec48e18772747a06debe04bdeaa5a38d618d1f542b00987eeba9f0e2fc3571f5:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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