Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 73096e80d01b4d05feb6f3c4bb134c7e80391b3513228893248bce0493ef6fab:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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