Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 59952e7f8e1e2d971112410d193b0ff036ad69de34ff011a368b107743e983cb:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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