Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1d3ff62b192da847358f4c6f31c8c3a2a7ec2e6734d97e5dd2e0a5a620a6a877:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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