Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 837a0b89c9fc51260da9ed8a48f852c9a717133c79cf8c559ec89a5c0317051f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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