Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> fafd9a1ac0507287bf590d0f0816308553904394b60702aeeba1b8d1d029ea1a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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