Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> bd84995504caa8326c5b8bd04d62a2a0ad796dda8a93bf8c565a25cc644f89f7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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