Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1ed100b7ca03614ced17d82df7787d7b856aa906e643ab96752cb60d0fb10c17:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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