Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5dabd8c8bf2f6a8266b4116d75d577dd29afc68d07a32c025f89881109d7e363:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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