Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 351df4e503ef4e6b3461a46471026701d2ffa7fb4c2cf70417727a611f106703:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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