Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1bbda3904f09798d54f18dfc290b2af3e5a4bfd34163ff22106e979317a04783:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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