Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e5bbd823b743e1632a092f22f78935c0c87a442a1a606d671e4d2d646ae70e1b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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