Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 008fb8e0a3de6384b50c0b66f7a0b2058edbea2dcbe305c396b3e14fd1ef473d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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