Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> eb7e84297665fe96c94da7c2bad6422884fcb7448a0d3b8f8e2555a26fcff098:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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