Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> cf9dc7fbdd15f0f84bd7242c3e95cac20f6a89b03c58324219fef23e86273c46:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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