Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 10b2ad6acb3a0f62eb13b210f9d3318c7696d1e07acdf33c473c50bb300cf045:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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