Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9f76912c452f1d2f5d9db6f417be612d68b1caf17caaabeb9efcdf60928ee8e1:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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