Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e8b08b1d983957333834b7183551c6429ba07989e36face077713cde917030b5:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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