Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 68f5591e3c6c86479e72f49f636c1eebeaf851b6ff25afe68fce02d48c30c011:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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