Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b0872fcd2687e7440a916a18446f5920dc204e1b59215a6e850dfac50ad62cbe:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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