Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ed62485dbb715c05f2560b14b5ba7884542b706c4ff6a4128c60c062cc886ad3:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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