Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 13cbeb1b5c717c9b286c5b4b3e11def0cc5ac9a6f3b657efb468af4f668dfbfb:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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