Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c142c334446c9f587448d57aeb6adc7f075c863b67f47dd1b7676f7a87fbe97f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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