Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> eee2c639433c605436fe800b88ffe1b84b882e020f5177aff068d96b45d33f4d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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