Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d5a98c9a55df9cab825e3768ac628c79bc8393ca481bd95302010f0f61d3e698:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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