Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> aab29250e2f1b110b57d2fc2d849bfdabc775a05dd56fc9ddcd8fe84e85ec585:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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