Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 69633be202f6d2b04a412f7c89be08f4e53dec6adcc06902e078265b6d82d211:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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