Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4d819585b009e96f83a8eea8fd44645ff7bfff822928a2f7409fc75a1eb3624a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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