Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> cee1b722f9115736ba53dd1bc8c8bdc42210d25ffa26cade25fa2b83e577ab9c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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