Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 200f6671250e3f809687d242efdb178ac1a68564bc205344d76b74f4d9b72b20:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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