Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a466c26c3d4e4133d1a88768019761c6aff88e95c88c67bbdc2b06a9283b08a6:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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