Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f3e147aeb5676bfbce57f0cc8ea98612ce8445d5253a5d45ce16fbc30ad82419:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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