Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d52b100389f2eee859e3b15ec3564b51a444488b7251fb5ade5dcbf38780079b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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