Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 150482065d2b1014d6f5c385d269b56ab64a03657cb543d0b1ab49ae1b211eab:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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