Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8621208078217b66db078e85b23bc36a16f4b5bdc96296861a9975f7ff4c6166:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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