Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 803f96debc283acd19c4db7afa4299b0faef467a2c75ed91e5a4c91a04443095:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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