Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 23c9c5c049816f494ac9e6cf553005ebf2dbaefe8c8c5e73f2616ddbb50b3119:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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