Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ab218baaf0d92db07dfe42408731d5bb49c0b4038e3ce8b143b1997aafc84a7a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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