Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 433fa27f1c1f74e6b9de0d4dd7036349ac89cc8c88598502a45cb7d1b2488ae9:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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