Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ae5368b507db9b84b52668e5a0782ba48184b1e1efd156cc371378d63764eebb:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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