Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ea6e5d9205d130911e63e6e00437d365fb97ff0bd04ecf674e2b0e78b4fbaa0f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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