Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> dfceae297c805aec486d8c3f74eb148636d8c8c0a7d5808d9d15bfb3dcc1845a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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