Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a56bf425889c60f9279029df5378d545b46663e37c99a1191ffa737ca808c6a0:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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