Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 381b4b1e8c6bfe441450a1f8b818fb292c1fa9af02684df8b0a2bbc117d3582b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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