Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1b97e601d1d849cb40a55b40670d6a7373c7e2b6209955e02605cab32395271b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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