Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3ac0df163bf3de0bab4a6ddec5729c02efe1aa530f5a806ee43b6dd014d4e1d6:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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