Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f1d902db66012ccb4e3de1fc93db6a6e4ea18a42da7694910b20f9251b0d385d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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