Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4efc983cfd0ae42977e845b69b94b038e3a6a5682a4b8ac73e357e43ad757b8a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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