Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> dfb70698820a28ead0a4985e21a24cfb863c46a3bfa3dc1e3f1c6bd222305e79:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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