Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2ce641978954e072eb5b6a8d24ae44b878a8f796d4e4c1d7f5f93fe4bd91c580:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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