Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d3987cf067c1a571df3cc71ce2f7fa1b62e1e68c0211d87c185b3f4da09edce7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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