Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 46d1c7c9ad7ebc62e7e2d2427b2a5ab20bd0a6f227c8e98b4e1fbc4e42f69aa0:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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