Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 19cae240eac1cb4561294cfe04007b83b86a39af9dbf40a1eafb328086e8622a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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