Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8f88e739b220a7d1a5714730641ee590d039f85b29d643dc1690c9a932b7f56d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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