Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 249f7fc85c2ba6e49fd3334a6e06e0252924bd46ee4326a71de92f1f629cabf3:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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