Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 67eee82ff7d821952af3fa6d68337406e8aaa3a5e7e802881aff3c6431ddf314:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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