Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8d16d8ec7f2e6ea496a8863d1219cef466dc03e9061def58339a47139f5aed43:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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