Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 76fa8376a365d3674e406711a33b818f838e016cdf9de52d708e2c20f274502b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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