Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9de49421707dc000c4d2b9ca8098c9e82ba0ba659c34bccbcdf9d57d935d2e2d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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