Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 79d38d53177af26df83f73ec992aa1e820b336a73e59c675e3b66ac194a627fd:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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