Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> be065b563be451c6c381ef2a7963ac25c1d1deab2766b9c7c1b7d17ba6f60c61:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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