Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 37ee2daba011399c28e092f56fc2f8919ac6aac3f05504b087aa1026e1b470ed:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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