Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> dd9df308e56c79829d019ab0a26ea004e7214af32df2f5b0ed6c2e95733f2448:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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