Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a829994b121d33270522739f4cbb41288b8b69b957f9b8d2833691f2dba728a5:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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