Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f969df5bb372e64dcd75f590e8708b83dd16d3489f72c08eaeaa17f1422a6d35:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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