Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> cae7fe552776b6a19389b33da5f583de6f594c6c867ca73eb40b40d54c2c6276:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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