Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 75e4c97af72866adb6debd7237a821ebb0012f4489dda39ff07826ce66d182a8:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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