Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 39b204ce9db854ecd7607446b79d1d6d2cb26f130d77ee28a0ff2c99c62d9a54:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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