Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 15000dca95e21499c1f381f71e2b2b663fb3d211fbfd534e157bc4ca77684382:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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