Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5511c28481be142ed57040368a87bcce6c7e207678138064f6c805bc7b936880:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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