Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 09662b99c8d2cb5d4734971a21093e181c2679f6d8c088bd48966a55c226dc2d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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