Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 51bf99ce19e56b63fa2fbac0a7e2f71720a6462118623052b4c1e9a58e690d2a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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