Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3b4e6ccef5e017060b2235e873452f23453c17badf0eb59bbcc129662f7889be:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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