Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7aea4a1a693e58e900b5066fd61db4239e6f09d34daff78f1d4ba7f85bfc87b8:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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