Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 12be8567ba5eb447a39f42f842624442f31771381ad8bf79ee10fb3999b584ee:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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