Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> fdcdfa5ba1f23dd7a683ad7e5be74b2781345d631361d872ea2d5159389f8fd4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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