Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 11671619aefe4180c00e61c915ba9fb5309e991cef1cd0497e83690eb5a1d952:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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