Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f495cb666cd79d056eb5bc54a0efb76e73b906ef58a8100c256e6f63b057d3fe:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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