Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e92c1196afdb75c81ca4ade78d81a98476a2c7e5f3152babd213d0dcfaa68502:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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