Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b28c104edbdd4b414fdf6017af9c48187a303e070f2b6811affbf1263cb761fc:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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