Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c8e8f6a2604a414d8fd00f0f75271d68164cd8716a9ee555d82381b41756172c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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