Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> db2f22d1acedb703283a7dba0665920927679d76ee3323d51f6b39e89674ebf3:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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