Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> bdaae7c88537e1e57d7b38e298c94f2e0f6f9c7a3a7b4f7e268e52ab1ed08dd0:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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