Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ef997911b18af078bb15e7aed533aed7509928fa523f7fd7d952e45dff54fb3e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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