Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7db49d2f0ba3dde781d5be89b7ca074c2a4e9b24c408d414e469692fb3a19289:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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