Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 226e34f4673227676c7ff1e4eab840a3e49a591fefccfb51072169c7364a3f8b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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