Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d234f1756c847c171ccaa4a7615921e3327a1999f4c8220e3742b76b5127cadf:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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