Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e297491fca955e04a3b8756f43e58b2a115f026995d18b1ba72538b7ea9f8867:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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