Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9435123b6f6d97fef3e2db587d187b78329226ff6d9a0bac425fea238275c137:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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