Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d8e56480378ed246125f6478aa6b898f8b5e048f5686b0f9405e4699c8a2167f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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