Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 424c5633d5a287ffc13181049d3a28e72ba2e923ed65d03c9666325ca27650d8:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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