Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> bd6d7a5ea93f9ae030e1127e54922d96cab18825711474ec2371919fe794db77:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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