Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d9c3fff368506c55576086e572a0d1886c1bd67cfbd425ad3008e1e5de5f0ba6:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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