Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e4c90426f491a67f1d4d5bb58dec8f9e9bcba72be2548fe006481112df11489b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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