Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2dd8d0f4e45b49355ab5c27ee95980ec2b8da47403827c11443e38b5306d9465:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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