Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4a3cf443320f9633083072025af429150ddf1f583be4d4058f8f2f72eb8a9d87:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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