Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> cb5e740cffaa5866d4c180c11b868f027d057f2cced0704ca698e89cebf27f18:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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