Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 591e4968f4029bc9ed1155017df34c945520e0731849ab205ca79221ccebab3f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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