Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> bd2cc640c73626d0ff4b05521068b0fba61cad4e674e4e5e2b44179c1c2f585d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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