Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 01a57659321d2d5b634720f33f50d3913c3e07de8c1111ff34bd7789b8b08b81:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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