Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b139bc5e6008065d11e1af893cb47e68e30885d321c604e86d93bc6d4698a35b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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