Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b72f6305bc5c2fef3090df4ab8a6593594b4342e13570819aaa9e1d60118a9b0:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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