Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 66cdba737d2b37179ba6630412fd2e8fa90fe21e96aac8fd1b17c9bdf61a7bf9:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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