Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 10c464ad2fe307fb43c008b1bc1039476c316e10439ab8c12c66f9164fe64909:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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