Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> caa6b359c9a341e657bfd651ccde5262be5d965b265a931d5f4973a2f0a03bd5:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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