Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 6d0e49161977611bc0d08dac6e13b09f23833f0a0bad0eea50a2c938d11f076d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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