Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 71867f162960eaf0e9c53b3acf1d02cace218ef576113ce8c7c575402db4bdfe:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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