Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b19890dcf1e4ca46916c9793b63602e3f841e9e6c875bbf47ecfd3730875fde2:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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