Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5f633bc1307773d12a8aa7af9658df4d759e00ff3667f424470e4e3638bbbf96:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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