Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 44ee82f064d42383672af05e694feb1bbc9cc27b7a4315dce10ec2bed6af63e3:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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