Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ea74d20543990efe1d00b41e01cfed23a8a8df14d0585008e390cf066b33bd12:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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