Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ebcf57ba2633e421711bfab80e443bb5215f206d113c527bf6acc4435a2b4f75:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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