Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2d768734212bc925e0bf05734c7471d201a6dbc5b5ca875b6d23d871c9fc8059:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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