Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 37e18b1476307e39fc3881a58f1ee1035d60e14a474ec2fb9e87d51cefaa25f3:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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