Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9920c53f99d0c4e62c6b263c1c2007ba23bd8298d5425c9f0158a99041f7298f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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