Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> bf3bca1a50441bc70cc7365727e1d5ed09969aa02e3f91801a8ff888bf09c5a4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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