Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1ad6cb7cc1e6ee1b4929bf5fba8b035a2daa4f0393a75c8ae200d8feaecf7af2:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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