Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 74c95b77005b3dc79fec51b395b501c1b8101686a525e32cfc2f14c72543ca09:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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