Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 539ba555594016465bfe4b78d9bb321c5b21bf3107fef840b3fcb94dc6ce2dc1:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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