Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ce973a8fd44c90421122124d3c50311a62722a108fcd45e6e1f064cba815fd5b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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