Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7a6bba01ef3419c4dd92e56ffef1fe0e95f85ba120277b7c3e429f4370f57ad3:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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