Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 74fc49ece303d608d6869463c2cb3b059643c734cb68d24c0fdb731a5539c5a3:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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