Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e6c9e61494fa31d50e629ebfd983a55a43b5692f83f2e525c74abfc7a0dc7ea9:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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