Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3522b5020c0204fe6ef6bd1b42570ab0011d02389c9055dc529c0a1888292f57:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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