Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2f45566a0d11d821e0718060862f8c2cd5222394b3e5daebac42d1b0dad7895e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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