Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e6d5d7d165a36aed2be55919c1d51e2e0ca59e58fe2370c07eb507cae9d9b18a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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