Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a3b3717251017a0f9ea9d5c53dba8716d3c2b3bf6e8454c29a19d32930ea6f6c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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