Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 42c5dfd205d855d7bf13effe6a8b2e7b9d89ec76bd542ca011dba727d35276be:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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