Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 6fa91433afff57fd8c070e2ec619c321d79e313618525e8f66e81836953481a7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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