Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 52fa83cb14ad3a4585aa86fe6c16593bb835b4ff782692fcfab35c1a0e0e35f4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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